diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd56700e1f..63347a136d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Enhance: PC画面でチャンネルが複数列で表示されるように  
   (Cherry-picked from https://github.com/Otaku-Social/maniakey/pull/13)
 - Enhance: 照会に失敗した場合、その理由を表示するように
+- Enhance: 連合がホワイトリスト化・無効化されているサーバー向けのデザイン修正
 - Fix: 画面サイズが変わった際にナビゲーションバーが自動で折りたたまれない問題を修正
 - Fix: サーバー情報メニューに区切り線が不足していたのを修正
 - Fix: ノートがログインしているユーザーしか見れない場合にログインダイアログを閉じるとその後の動線がなくなる問題を修正
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 63878d3d47..625f5f28d0 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -5222,6 +5222,14 @@ export interface Locale extends ILocale {
      * 注意事項を理解した上でオンにします。
      */
     "acknowledgeNotesAndEnable": string;
+    /**
+     * このサーバーはホワイトリスト連合で運用されています。管理者が指定したサーバー以外とやり取りすることはできません。
+     */
+    "federationSpecified": string;
+    /**
+     * このサーバーは連合が無効化されています。他のサーバーのユーザーとやり取りすることはできません。
+     */
+    "federationDisabled": string;
     "_accountSettings": {
         /**
          * コンテンツの表示にログインを必須にする
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index d78bd4ee65..549b798ca8 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1301,6 +1301,8 @@ lockdown: "ロックダウン"
 pleaseSelectAccount: "アカウントを選択してください"
 availableRoles: "利用可能なロール"
 acknowledgeNotesAndEnable: "注意事項を理解した上でオンにします。"
+federationSpecified: "このサーバーはホワイトリスト連合で運用されています。管理者が指定したサーバー以外とやり取りすることはできません。"
+federationDisabled: "このサーバーは連合が無効化されています。他のサーバーのユーザーとやり取りすることはできません。"
 
 _accountSettings:
   requireSigninToViewContents: "コンテンツの表示にログインを必須にする"
diff --git a/packages/backend/src/core/entities/MetaEntityService.ts b/packages/backend/src/core/entities/MetaEntityService.ts
index 409dca3426..ec0b5360f4 100644
--- a/packages/backend/src/core/entities/MetaEntityService.ts
+++ b/packages/backend/src/core/entities/MetaEntityService.ts
@@ -132,6 +132,7 @@ export class MetaEntityService {
 			enableUrlPreview: instance.urlPreviewEnabled,
 			noteSearchableScope: (this.config.meilisearch == null || this.config.meilisearch.scope !== 'local') ? 'global' : 'local',
 			maxFileSize: this.config.maxFileSize,
+			federation: this.meta.federation,
 		};
 
 		return packed;
diff --git a/packages/backend/src/models/json-schema/meta.ts b/packages/backend/src/models/json-schema/meta.ts
index e3fd63464a..e7ae2ee8e5 100644
--- a/packages/backend/src/models/json-schema/meta.ts
+++ b/packages/backend/src/models/json-schema/meta.ts
@@ -261,6 +261,11 @@ export const packedMetaLiteSchema = {
 			type: 'number',
 			optional: false, nullable: false,
 		},
+		federation: {
+			type: 'string',
+			enum: ['all', 'specified', 'none'],
+			optional: false, nullable: false,
+		},
 	},
 } as const;
 
diff --git a/packages/frontend/src/components/MkInstanceStats.vue b/packages/frontend/src/components/MkInstanceStats.vue
index 8ccbf61e48..d8066857fe 100644
--- a/packages/frontend/src/components/MkInstanceStats.vue
+++ b/packages/frontend/src/components/MkInstanceStats.vue
@@ -10,7 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.chart">
 			<div class="selects">
 				<MkSelect v-model="chartSrc" style="margin: 0; flex: 1;">
-					<optgroup :label="i18n.ts.federation">
+					<optgroup v-if="shouldShowFederation" :label="i18n.ts.federation">
 						<option value="federation">{{ i18n.ts._charts.federation }}</option>
 						<option value="ap-request">{{ i18n.ts._charts.apRequest }}</option>
 					</optgroup>
@@ -22,7 +22,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<optgroup :label="i18n.ts.notes">
 						<option value="notes">{{ i18n.ts._charts.notesIncDec }}</option>
 						<option value="local-notes">{{ i18n.ts._charts.localNotesIncDec }}</option>
-						<option value="remote-notes">{{ i18n.ts._charts.remoteNotesIncDec }}</option>
+						<option v-if="shouldShowFederation" value="remote-notes">{{ i18n.ts._charts.remoteNotesIncDec }}</option>
 						<option value="notes-total">{{ i18n.ts._charts.notesTotal }}</option>
 					</optgroup>
 					<optgroup :label="i18n.ts.drive">
@@ -46,9 +46,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<MkSelect v-model="heatmapSrc" style="margin: 0 0 12px 0;">
 			<option value="active-users">Active users</option>
 			<option value="notes">Notes</option>
-			<option value="ap-requests-inbox-received">AP Requests: inboxReceived</option>
-			<option value="ap-requests-deliver-succeeded">AP Requests: deliverSucceeded</option>
-			<option value="ap-requests-deliver-failed">AP Requests: deliverFailed</option>
+			<option v-if="shouldShowFederation" value="ap-requests-inbox-received">AP Requests: inboxReceived</option>
+			<option v-if="shouldShowFederation" value="ap-requests-deliver-succeeded">AP Requests: deliverSucceeded</option>
+			<option v-if="shouldShowFederation" value="ap-requests-deliver-failed">AP Requests: deliverFailed</option>
 		</MkSelect>
 		<div class="_panel" :class="$style.heatmap">
 			<MkHeatmap :src="heatmapSrc" :label="'Read & Write'"/>
@@ -65,7 +65,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 	</MkFoldableSection>
 
-	<MkFoldableSection class="item">
+	<MkFoldableSection v-if="shouldShowFederation" class="item">
 		<template #header>Federation</template>
 		<div :class="$style.federation">
 			<div class="pies">
@@ -84,13 +84,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { onMounted, ref, shallowRef } from 'vue';
+import { onMounted, ref, computed, shallowRef } from 'vue';
 import { Chart } from 'chart.js';
 import MkSelect from '@/components/MkSelect.vue';
 import MkChart from '@/components/MkChart.vue';
 import { useChartTooltip } from '@/scripts/use-chart-tooltip.js';
+import { $i } from '@/account.js';
 import * as os from '@/os.js';
 import { misskeyApiGet } from '@/scripts/misskey-api.js';
+import { instance } from '@/instance.js';
 import { i18n } from '@/i18n.js';
 import MkHeatmap, { type HeatmapSource } from '@/components/MkHeatmap.vue';
 import MkFoldableSection from '@/components/MkFoldableSection.vue';
@@ -100,6 +102,8 @@ import { initChart } from '@/scripts/init-chart.js';
 
 initChart();
 
+const shouldShowFederation = computed(() => instance.federation !== 'none' || $i?.isModerator);
+
 const chartLimit = 500;
 const chartSpan = ref<'hour' | 'day'>('hour');
 const chartSrc = ref('active-users');
diff --git a/packages/frontend/src/components/MkSignupDialog.rules.vue b/packages/frontend/src/components/MkSignupDialog.rules.vue
index e2a06dd91f..999e843325 100644
--- a/packages/frontend/src/components/MkSignupDialog.rules.vue
+++ b/packages/frontend/src/components/MkSignupDialog.rules.vue
@@ -10,8 +10,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</div>
 	<MkSpacer :marginMin="20" :marginMax="28">
 		<div class="_gaps_m">
-			<div v-if="instance.disableRegistration">
-				<MkInfo warn>{{ i18n.ts.invitationRequiredToRegister }}</MkInfo>
+			<div v-if="instance.disableRegistration || instance.federation !== 'all'" class="_gaps_s">
+				<MkInfo v-if="instance.disableRegistration" warn>{{ i18n.ts.invitationRequiredToRegister }}</MkInfo>
+				<MkInfo v-if="instance.federation === 'specified'" warn>{{ i18n.ts.federationSpecified }}</MkInfo>
+				<MkInfo v-else-if="instance.federation === 'none'" warn>{{ i18n.ts.federationDisabled }}</MkInfo>
 			</div>
 
 			<div style="text-align: center;">
diff --git a/packages/frontend/src/components/MkUserSelectDialog.vue b/packages/frontend/src/components/MkUserSelectDialog.vue
index 764bf74f21..63af652cbc 100644
--- a/packages/frontend/src/components/MkUserSelectDialog.vue
+++ b/packages/frontend/src/components/MkUserSelectDialog.vue
@@ -16,7 +16,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<template #header>{{ i18n.ts.selectUser }}</template>
 	<div>
 		<div :class="$style.form">
-			<MkInput v-if="localOnly" v-model="username" :autofocus="true" @update:modelValue="search">
+			<MkInput v-if="computedLocalOnly" v-model="username" :autofocus="true" @update:modelValue="search">
 				<template #label>{{ i18n.ts.username }}</template>
 				<template #prefix>@</template>
 			</MkInput>
@@ -61,7 +61,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { onMounted, ref, shallowRef } from 'vue';
+import { onMounted, ref, computed, shallowRef } from 'vue';
 import * as Misskey from 'misskey-js';
 import MkInput from '@/components/MkInput.vue';
 import FormSplit from '@/components/form/split.vue';
@@ -70,6 +70,7 @@ import { misskeyApi } from '@/scripts/misskey-api.js';
 import { defaultStore } from '@/store.js';
 import { i18n } from '@/i18n.js';
 import { $i } from '@/account.js';
+import { instance } from '@/instance.js';
 import { host as currentHost, hostname } from '@@/js/config.js';
 
 const emit = defineEmits<{
@@ -86,6 +87,8 @@ const props = withDefaults(defineProps<{
 	localOnly: false,
 });
 
+const computedLocalOnly = computed(() => props.localOnly || instance.federation === 'none');
+
 const username = ref('');
 const host = ref('');
 const users = ref<Misskey.entities.UserLite[]>([]);
@@ -100,7 +103,7 @@ function search() {
 	}
 	misskeyApi('users/search-by-username-and-host', {
 		username: username.value,
-		host: props.localOnly ? '.' : host.value,
+		host: computedLocalOnly.value ? '.' : host.value,
 		limit: 10,
 		detail: false,
 	}).then(_users => {
@@ -142,7 +145,7 @@ onMounted(() => {
 	}).then(foundUsers => {
 		let _users = foundUsers;
 		_users = _users.filter((u) => {
-			if (props.localOnly) {
+			if (computedLocalOnly.value) {
 				return u.host == null;
 			} else {
 				return true;
diff --git a/packages/frontend/src/components/MkVisitorDashboard.vue b/packages/frontend/src/components/MkVisitorDashboard.vue
index 97c765d81c..9554d6fff0 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.vue
@@ -18,8 +18,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<!-- eslint-disable-next-line vue/no-v-html -->
 				<div v-html="instance.description || i18n.ts.headlineMisskey"></div>
 			</div>
-			<div v-if="instance.disableRegistration" :class="$style.mainWarn">
-				<MkInfo warn>{{ i18n.ts.invitationRequiredToRegister }}</MkInfo>
+			<div v-if="instance.disableRegistration || instance.federation !== 'all'" :class="$style.mainWarn" class="_gaps_s">
+				<MkInfo v-if="instance.disableRegistration" warn>{{ i18n.ts.invitationRequiredToRegister }}</MkInfo>
+				<MkInfo v-if="instance.federation === 'specified'" warn>{{ i18n.ts.federationSpecified }}</MkInfo>
+				<MkInfo v-else-if="instance.federation === 'none'" warn>{{ i18n.ts.federationDisabled }}</MkInfo>
 			</div>
 			<div class="_gaps_s" :class="$style.mainActions">
 				<MkButton :class="$style.mainAction" full rounded gradate data-cy-signup style="margin-right: 12px;" @click="signup()">{{ i18n.ts.joinThisServer }}</MkButton>
diff --git a/packages/frontend/src/components/MkWidgets.vue b/packages/frontend/src/components/MkWidgets.vue
index ba619f6063..44f6921a85 100644
--- a/packages/frontend/src/components/MkWidgets.vue
+++ b/packages/frontend/src/components/MkWidgets.vue
@@ -9,7 +9,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<header :class="$style.editHeader">
 			<MkSelect v-model="widgetAdderSelected" style="margin-bottom: var(--MI-margin)" data-cy-widget-select>
 				<template #label>{{ i18n.ts.selectWidget }}</template>
-				<option v-for="widget in widgetDefs" :key="widget" :value="widget">{{ i18n.ts._widgets[widget] }}</option>
+				<option v-for="widget in _widgetDefs" :key="widget" :value="widget">{{ i18n.ts._widgets[widget] }}</option>
 			</MkSelect>
 			<MkButton inline primary data-cy-widget-add @click="addWidget"><i class="ti ti-plus"></i> {{ i18n.ts.add }}</MkButton>
 			<MkButton inline @click="emit('exit')">{{ i18n.ts.close }}</MkButton>
@@ -34,7 +34,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</template>
 		</Sortable>
 	</template>
-	<component :is="`widget-${widget.name}`" v-for="widget in widgets" v-else :key="widget.id" :ref="el => widgetRefs[widget.id] = el" :class="$style.widget" :widget="widget" @updateProps="updateWidget(widget.id, $event)" @contextmenu.stop="onContextmenu(widget, $event)"/>
+	<component :is="`widget-${widget.name}`" v-for="widget in _widgets" v-else :key="widget.id" :ref="el => widgetRefs[widget.id] = el" :class="$style.widget" :widget="widget" @updateProps="updateWidget(widget.id, $event)" @contextmenu.stop="onContextmenu(widget, $event)"/>
 </div>
 </template>
 
@@ -50,13 +50,14 @@ export type DefaultStoredWidget = {
 </script>
 
 <script lang="ts" setup>
-import { defineAsyncComponent, ref } from 'vue';
+import { defineAsyncComponent, ref, computed } from 'vue';
 import { v4 as uuid } from 'uuid';
 import MkSelect from '@/components/MkSelect.vue';
 import MkButton from '@/components/MkButton.vue';
-import { widgets as widgetDefs } from '@/widgets/index.js';
+import { widgets as widgetDefs, federationWidgets } from '@/widgets/index.js';
 import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
+import { instance } from '@/instance.js';
 import { isLink } from '@@/js/is-link.js';
 
 const Sortable = defineAsyncComponent(() => import('vuedraggable').then(x => x.default));
@@ -66,6 +67,16 @@ const props = defineProps<{
 	edit: boolean;
 }>();
 
+const _widgetDefs = computed(() => {
+	if (instance.federation === 'none') {
+		return widgetDefs.filter(x => !federationWidgets.includes(x));
+	} else {
+		return widgetDefs;
+	}
+});
+
+const _widgets = computed(() => props.widgets.filter(x => _widgetDefs.value.includes(x.name)));
+
 const emit = defineEmits<{
 	(ev: 'updateWidgets', widgets: Widget[]): void;
 	(ev: 'addWidget', widget: Widget): void;
diff --git a/packages/frontend/src/pages/about.vue b/packages/frontend/src/pages/about.vue
index 8dfeb6d2a7..ef0fd39ffe 100644
--- a/packages/frontend/src/pages/about.vue
+++ b/packages/frontend/src/pages/about.vue
@@ -13,7 +13,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<MkSpacer v-else-if="tab === 'emojis'" :contentMax="1000" :marginMin="20">
 			<XEmojis/>
 		</MkSpacer>
-		<MkSpacer v-else-if="tab === 'federation'" :contentMax="1000" :marginMin="20">
+		<MkSpacer v-else-if="instance.federation !== 'none' && tab === 'federation'" :contentMax="1000" :marginMin="20">
 			<XFederation/>
 		</MkSpacer>
 		<MkSpacer v-else-if="tab === 'charts'" :contentMax="1000" :marginMin="20">
@@ -25,6 +25,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { computed, defineAsyncComponent, ref, watch } from 'vue';
+import { instance } from '@/instance.js';
 import { i18n } from '@/i18n.js';
 import { claimAchievement } from '@/scripts/achievements.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
@@ -51,22 +52,34 @@ watch(tab, () => {
 
 const headerActions = computed(() => []);
 
-const headerTabs = computed(() => [{
-	key: 'overview',
-	title: i18n.ts.overview,
-}, {
-	key: 'emojis',
-	title: i18n.ts.customEmojis,
-	icon: 'ti ti-icons',
-}, {
-	key: 'federation',
-	title: i18n.ts.federation,
-	icon: 'ti ti-whirl',
-}, {
-	key: 'charts',
-	title: i18n.ts.charts,
-	icon: 'ti ti-chart-line',
-}]);
+const headerTabs = computed(() => {
+	const items = [];
+
+	items.push({
+		key: 'overview',
+		title: i18n.ts.overview,
+	}, {
+		key: 'emojis',
+		title: i18n.ts.customEmojis,
+		icon: 'ti ti-icons',
+	});
+
+	if (instance.federation !== 'none') {
+		items.push({
+			key: 'federation',
+			title: i18n.ts.federation,
+			icon: 'ti ti-whirl',
+		});
+	}
+
+	items.push({
+		key: 'charts',
+		title: i18n.ts.charts,
+		icon: 'ti ti-chart-line',
+	});
+
+	return items;
+});
 
 definePageMetadata(() => ({
 	title: i18n.ts.instanceInfo,
diff --git a/packages/frontend/src/pages/explore.users.vue b/packages/frontend/src/pages/explore.users.vue
index c9acfec04f..56ae08b322 100644
--- a/packages/frontend/src/pages/explore.users.vue
+++ b/packages/frontend/src/pages/explore.users.vue
@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <MkSpacer :contentMax="1200">
-	<MkTab v-model="origin" style="margin-bottom: var(--MI-margin);">
+	<MkTab v-if="instance.federation !== 'none'" v-model="origin" style="margin-bottom: var(--MI-margin);">
 		<option value="local">{{ i18n.ts.local }}</option>
 		<option value="remote">{{ i18n.ts.remote }}</option>
 	</MkTab>
@@ -69,6 +69,7 @@ import MkUserList from '@/components/MkUserList.vue';
 import MkFoldableSection from '@/components/MkFoldableSection.vue';
 import MkTab from '@/components/MkTab.vue';
 import { misskeyApi } from '@/scripts/misskey-api.js';
+import { instance } from '@/instance.js';
 import { i18n } from '@/i18n.js';
 
 const props = defineProps<{
diff --git a/packages/frontend/src/pages/search.note.vue b/packages/frontend/src/pages/search.note.vue
index 105c947d25..4cb149a58b 100644
--- a/packages/frontend/src/pages/search.note.vue
+++ b/packages/frontend/src/pages/search.note.vue
@@ -13,15 +13,17 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<template #header>{{ i18n.ts.options }}</template>
 
 			<div class="_gaps_m">
-				<MkRadios v-model="hostSelect">
-					<template #label>{{ i18n.ts.host }}</template>
-					<option value="all" default>{{ i18n.ts.all }}</option>
-					<option value="local">{{ i18n.ts.local }}</option>
-					<option v-if="noteSearchableScope === 'global'" value="specified">{{ i18n.ts.specifyHost }}</option>
-				</MkRadios>
-				<MkInput v-if="noteSearchableScope === 'global'" v-model="hostInput" :disabled="hostSelect !== 'specified'" :large="true" type="search">
-					<template #prefix><i class="ti ti-server"></i></template>
-				</MkInput>
+				<template v-if="instance.federation !== 'none'">
+					<MkRadios v-model="hostSelect">
+						<template #label>{{ i18n.ts.host }}</template>
+						<option value="all" default>{{ i18n.ts.all }}</option>
+						<option value="local">{{ i18n.ts.local }}</option>
+						<option v-if="noteSearchableScope === 'global'" value="specified">{{ i18n.ts.specifyHost }}</option>
+					</MkRadios>
+					<MkInput v-if="noteSearchableScope === 'global'" v-model="hostInput" :disabled="hostSelect !== 'specified'" :large="true" type="search">
+						<template #prefix><i class="ti ti-server"></i></template>
+					</MkInput>
+				</template>
 
 				<MkFolder :defaultOpen="true">
 					<template #label>{{ i18n.ts.specifyUser }}</template>
@@ -102,7 +104,7 @@ setHostSelectWithInput(hostInput.value, undefined);
 watch(hostInput, setHostSelectWithInput);
 
 const searchHost = computed(() => {
-	if (hostSelect.value === 'local') return '.';
+	if (hostSelect.value === 'local' || instance.federation === 'none') return '.';
 	if (hostSelect.value === 'specified') return hostInput.value;
 	return null;
 });
diff --git a/packages/frontend/src/pages/search.user.vue b/packages/frontend/src/pages/search.user.vue
index 724fbfdfbd..e8bc4cd6d3 100644
--- a/packages/frontend/src/pages/search.user.vue
+++ b/packages/frontend/src/pages/search.user.vue
@@ -9,7 +9,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<MkInput v-model="searchQuery" :large="true" :autofocus="true" type="search" @enter.prevent="search">
 			<template #prefix><i class="ti ti-search"></i></template>
 		</MkInput>
-		<MkRadios v-model="searchOrigin" @update:modelValue="search()">
+		<MkRadios v-if="instance.federation !== 'none'" v-model="searchOrigin" @update:modelValue="search()">
 			<option value="combined">{{ i18n.ts.all }}</option>
 			<option value="local">{{ i18n.ts.local }}</option>
 			<option value="remote">{{ i18n.ts.remote }}</option>
@@ -33,6 +33,7 @@ import MkInput from '@/components/MkInput.vue';
 import MkRadios from '@/components/MkRadios.vue';
 import MkButton from '@/components/MkButton.vue';
 import { i18n } from '@/i18n.js';
+import { instance } from '@/instance.js';
 import * as os from '@/os.js';
 import MkFoldableSection from '@/components/MkFoldableSection.vue';
 import { misskeyApi } from '@/scripts/misskey-api.js';
@@ -113,7 +114,7 @@ async function search() {
 		limit: 10,
 		params: {
 			query: query,
-			origin: searchOrigin.value,
+			origin: instance.federation === 'none' ? 'local' : searchOrigin.value,
 		},
 	};
 
diff --git a/packages/frontend/src/pages/settings/general.vue b/packages/frontend/src/pages/settings/general.vue
index 1bfdfd0e76..1ee7909aa8 100644
--- a/packages/frontend/src/pages/settings/general.vue
+++ b/packages/frontend/src/pages/settings/general.vue
@@ -64,7 +64,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkSwitch v-model="limitWidthOfReaction">{{ i18n.ts.limitWidthOfReaction }}</MkSwitch>
 			</div>
 
-			<MkSelect v-model="instanceTicker">
+			<MkSelect v-if="instance.federation !== 'none'" v-model="instanceTicker">
 				<template #label>{{ i18n.ts.instanceTicker }}</template>
 				<option value="none">{{ i18n.ts._instanceTicker.none }}</option>
 				<option value="remote">{{ i18n.ts._instanceTicker.remote }}</option>
@@ -263,6 +263,7 @@ import MkLink from '@/components/MkLink.vue';
 import MkInfo from '@/components/MkInfo.vue';
 import { defaultStore } from '@/store.js';
 import * as os from '@/os.js';
+import { instance } from '@/instance.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
 import { reloadAsk } from '@/scripts/reload-ask.js';
 import { i18n } from '@/i18n.js';
diff --git a/packages/frontend/src/pages/settings/mute-block.vue b/packages/frontend/src/pages/settings/mute-block.vue
index 4d413d53ab..f1618c617a 100644
--- a/packages/frontend/src/pages/settings/mute-block.vue
+++ b/packages/frontend/src/pages/settings/mute-block.vue
@@ -19,7 +19,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<XWordMute :muted="$i.hardMutedWords" @save="saveHardMutedWords"/>
 	</MkFolder>
 
-	<MkFolder>
+	<MkFolder v-if="instance.federation !== 'none'">
 		<template #icon><i class="ti ti-planet-off"></i></template>
 		<template #label>{{ i18n.ts.instanceMute }}</template>
 
@@ -136,7 +136,7 @@ import { definePageMetadata } from '@/scripts/page-metadata.js';
 import MkUserCardMini from '@/components/MkUserCardMini.vue';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
-import { infoImageUrl } from '@/instance.js';
+import { instance, infoImageUrl } from '@/instance.js';
 import { signinRequired } from '@/account.js';
 import MkFolder from '@/components/MkFolder.vue';
 
diff --git a/packages/frontend/src/pages/settings/privacy.vue b/packages/frontend/src/pages/settings/privacy.vue
index 40d9be0f60..54a5aeb6c1 100644
--- a/packages/frontend/src/pages/settings/privacy.vue
+++ b/packages/frontend/src/pages/settings/privacy.vue
@@ -53,7 +53,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<template #caption>
 					<div>{{ i18n.ts._accountSettings.requireSigninToViewContentsDescription1 }}</div>
 					<div><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.requireSigninToViewContentsDescription2 }}</div>
-					<div><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.requireSigninToViewContentsDescription3 }}</div>
+					<div v-if="instance.federation !== 'none'"><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.requireSigninToViewContentsDescription3 }}</div>
 				</template>
 			</MkSwitch>
 
@@ -89,7 +89,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 				<template #caption>
 					<div>{{ i18n.ts._accountSettings.makeNotesFollowersOnlyBeforeDescription }}</div>
-					<div><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.mayNotEffectForFederatedNotes }}</div>
+					<div v-if="instance.federation !== 'none'"><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.mayNotEffectForFederatedNotes }}</div>
 				</template>
 			</FormSlot>
 
@@ -125,7 +125,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 				<template #caption>
 					<div>{{ i18n.ts._accountSettings.makeNotesHiddenBeforeDescription }}</div>
-					<div><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.mayNotEffectForFederatedNotes }}</div>
+					<div v-if="instance.federation !== 'none'"><i class="ti ti-alert-triangle" style="color: var(--MI_THEME-warn);"></i> {{ i18n.ts._accountSettings.mayNotEffectForFederatedNotes }}</div>
 				</template>
 			</FormSlot>
 		</div>
@@ -167,6 +167,7 @@ import MkFolder from '@/components/MkFolder.vue';
 import { misskeyApi } from '@/scripts/misskey-api.js';
 import { defaultStore } from '@/store.js';
 import { i18n } from '@/i18n.js';
+import { instance } from '@/instance.js';
 import { signinRequired } from '@/account.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 import FormSlot from '@/components/form/slot.vue';
@@ -219,7 +220,7 @@ watch([makeNotesFollowersOnlyBefore, makeNotesHiddenBefore], () => {
 });
 
 async function update_requireSigninToViewContents(value: boolean) {
-	if (value) {
+	if (value === true && instance.federation !== 'none') {
 		const { canceled } = await os.confirm({
 			type: 'warning',
 			text: i18n.ts.acknowledgeNotesAndEnable,
diff --git a/packages/frontend/src/pages/settings/statusbar.statusbar.vue b/packages/frontend/src/pages/settings/statusbar.statusbar.vue
index 67943524ef..140b6beb14 100644
--- a/packages/frontend/src/pages/settings/statusbar.statusbar.vue
+++ b/packages/frontend/src/pages/settings/statusbar.statusbar.vue
@@ -8,7 +8,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<MkSelect v-model="statusbar.type" placeholder="Please select">
 		<template #label>{{ i18n.ts.type }}</template>
 		<option value="rss">RSS</option>
-		<option value="federation">Federation</option>
+		<option v-if="instance.federation !== 'none'" value="federation">Federation</option>
 		<option value="userList">User list timeline</option>
 	</MkSelect>
 
@@ -96,6 +96,7 @@ import MkButton from '@/components/MkButton.vue';
 import MkRange from '@/components/MkRange.vue';
 import { defaultStore } from '@/store.js';
 import { i18n } from '@/i18n.js';
+import { instance } from '@/instance.js';
 import { deepClone } from '@/scripts/clone.js';
 
 const props = defineProps<{
diff --git a/packages/frontend/src/scripts/please-login.ts b/packages/frontend/src/scripts/please-login.ts
index 43dcf11936..a8a330eb6d 100644
--- a/packages/frontend/src/scripts/please-login.ts
+++ b/packages/frontend/src/scripts/please-login.ts
@@ -5,6 +5,7 @@
 
 import { defineAsyncComponent } from 'vue';
 import { $i } from '@/account.js';
+import { instance } from '@/instance.js';
 import { i18n } from '@/i18n.js';
 import { popup } from '@/os.js';
 
@@ -51,10 +52,17 @@ export function pleaseLogin(opts: {
 } = {}) {
 	if ($i) return;
 
+	let _openOnRemote: OpenOnRemoteOptions | undefined = undefined;
+
+	// 連合できる場合と、（連合ができなくても）共有する場合は外部連携オプションを設定
+	if (opts.openOnRemote != null && (instance.federation !== 'none' || opts.openOnRemote.type === 'share')) {
+		_openOnRemote = opts.openOnRemote;
+	}
+
 	const { dispose } = popup(defineAsyncComponent(() => import('@/components/MkSigninDialog.vue')), {
 		autoSet: true,
-		message: opts.message ?? (opts.openOnRemote ? i18n.ts.signinOrContinueOnRemote : i18n.ts.signinRequired),
-		openOnRemote: opts.openOnRemote,
+		message: opts.message ?? (_openOnRemote ? i18n.ts.signinOrContinueOnRemote : i18n.ts.signinRequired),
+		openOnRemote: _openOnRemote,
 	}, {
 		cancelled: () => {
 			if (opts.path) {
diff --git a/packages/frontend/src/ui/_common_/common.ts b/packages/frontend/src/ui/_common_/common.ts
index b31254196a..8e5ba8927a 100644
--- a/packages/frontend/src/ui/_common_/common.ts
+++ b/packages/frontend/src/ui/_common_/common.ts
@@ -56,12 +56,18 @@ export function openInstanceMenu(ev: MouseEvent) {
 		text: i18n.ts.customEmojis,
 		icon: 'ti ti-icons',
 		to: '/about#emojis',
-	}, {
-		type: 'link',
-		text: i18n.ts.federation,
-		icon: 'ti ti-whirl',
-		to: '/about#federation',
-	}, {
+	});
+
+	if (instance.federation !== 'none') {
+		menuItems.push({
+			type: 'link',
+			text: i18n.ts.federation,
+			icon: 'ti ti-whirl',
+			to: '/about#federation',
+		});
+	}
+
+	menuItems.push({
 		type: 'link',
 		text: i18n.ts.charts,
 		icon: 'ti ti-chart-line',
diff --git a/packages/frontend/src/ui/_common_/statusbars.vue b/packages/frontend/src/ui/_common_/statusbars.vue
index 5f9a938017..ed881bef22 100644
--- a/packages/frontend/src/ui/_common_/statusbars.vue
+++ b/packages/frontend/src/ui/_common_/statusbars.vue
@@ -15,7 +15,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	>
 		<span :class="$style.name">{{ x.name }}</span>
 		<XRss v-if="x.type === 'rss'" :class="$style.body" :refreshIntervalSec="x.props.refreshIntervalSec" :marqueeDuration="x.props.marqueeDuration" :marqueeReverse="x.props.marqueeReverse" :display="x.props.display" :url="x.props.url" :shuffle="x.props.shuffle"/>
-		<XFederation v-else-if="x.type === 'federation'" :class="$style.body" :refreshIntervalSec="x.props.refreshIntervalSec" :marqueeDuration="x.props.marqueeDuration" :marqueeReverse="x.props.marqueeReverse" :display="x.props.display" :colored="x.props.colored"/>
+		<XFederation v-else-if="x.type === 'federation' && instance.federation !== 'none'" :class="$style.body" :refreshIntervalSec="x.props.refreshIntervalSec" :marqueeDuration="x.props.marqueeDuration" :marqueeReverse="x.props.marqueeReverse" :display="x.props.display" :colored="x.props.colored"/>
 		<XUserList v-else-if="x.type === 'userList'" :class="$style.body" :refreshIntervalSec="x.props.refreshIntervalSec" :marqueeDuration="x.props.marqueeDuration" :marqueeReverse="x.props.marqueeReverse" :display="x.props.display" :userListId="x.props.userListId"/>
 	</div>
 </div>
@@ -23,6 +23,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { defineAsyncComponent } from 'vue';
+import { instance } from '@/instance.js';
 import { defaultStore } from '@/store.js';
 const XRss = defineAsyncComponent(() => import('./statusbar-rss.vue'));
 const XFederation = defineAsyncComponent(() => import('./statusbar-federation.vue'));
diff --git a/packages/frontend/src/widgets/index.ts b/packages/frontend/src/widgets/index.ts
index e269fcf9eb..c5be25e7df 100644
--- a/packages/frontend/src/widgets/index.ts
+++ b/packages/frontend/src/widgets/index.ts
@@ -36,6 +36,12 @@ export default function(app: App) {
 	app.component('WidgetBirthdayFollowings', defineAsyncComponent(() => import('./WidgetBirthdayFollowings.vue')));
 }
 
+// 連合関連のウィジェット（連合無効時に隠す）
+export const federationWidgets = [
+	'federation',
+	'instanceCloud',
+];
+
 export const widgets = [
 	'profile',
 	'instanceInfo',
@@ -51,8 +57,6 @@ export const widgets = [
 	'photos',
 	'digitalClock',
 	'unixClock',
-	'federation',
-	'instanceCloud',
 	'postForm',
 	'slideshow',
 	'serverMetric',
@@ -65,4 +69,6 @@ export const widgets = [
 	'userList',
 	'clicker',
 	'birthdayFollowings',
+
+	...federationWidgets,
 ];
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 42ca05e057..6358f36515 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -5029,6 +5029,8 @@ export type components = {
        */
       noteSearchableScope: 'local' | 'global';
       maxFileSize: number;
+      /** @enum {string} */
+      federation: 'all' | 'specified' | 'none';
     };
     MetaDetailedOnly: {
       features?: {