diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3efa0279b8..68525c3ab5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 - Enhance: ウィジェットの表示設定をプレビューを見ながら行えるように
 - Enhance: ウィジェットの設定項目のラベルの多言語対応
 - Enhance: 画面幅が広いときにメディアを横並びで表示できるようにするオプションを追加
+- Enhance: センシティブチャンネルの投稿が多くの場所で畳まれるようになりました
 - Enhance: パフォーマンスの向上
 - Fix: ドライブクリーナーでファイルを削除しても画面に反映されない問題を修正 #16061
 - Fix: 非ログイン時にログインを求めるダイアログが表示された後にダイアログのぼかしが解除されず操作不能になることがある問題を修正
@@ -55,6 +56,7 @@ v2025.12.0で行われた「configの`trustProxy`のデフォルト値を`false`
 - Fix: デッキUIでメニュー位置を下にしているとプロファイル削除ボタンが表示されないのを修正  
 - Fix: 一部のUnicode絵文字のリアクションがボタンにならない問題を修正
 
+
 ### Server
 - Enhance: Misskey内部でのIPアドレスペースでのレートリミットを無効化できるように
   - リバースプロキシやCDNなど別のレイヤで別途レートリミットを設定する場合や、ローカルでのテスト用途等として利用することを想定しています。
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 45d2efdf35..713543ea01 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -840,6 +840,8 @@ emailNotification: "メール通知"
 publish: "公開"
 inChannelSearch: "チャンネル内検索"
 useReactionPickerForContextMenu: "右クリックでリアクションピッカーを開く"
+collapseSensitiveChannel: "センシティブチャンネルの投稿を隠す"
+collapseSensitiveChannelDescription: "そのチャンネル内・通知・ホームタイムラインなど、一部の場所では引き続き表示されます。"
 typingUsers: "{users}が入力中"
 jumpToSpecifiedDate: "特定の日付にジャンプ"
 showingPastTimeline: "過去のタイムラインを表示しています"
@@ -1282,6 +1284,7 @@ backToTitle: "タイトルへ"
 hemisphere: "お住まいの地域"
 withSensitive: "センシティブなファイルを含むノートを表示"
 userSaysSomethingSensitive: "{name}のセンシティブなファイルを含む投稿"
+userSaysSomethingInSensitiveChannel: "{name}のセンシティブチャンネルでの投稿"
 enableHorizontalSwipe: "スワイプしてタブを切り替える"
 loading: "読み込み中"
 surrender: "やめる"
diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index c78cc44425..895e2e3c0b 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -169,6 +169,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 			</MkA>
 		</template>
 	</I18n>
+	<I18n v-else-if="muted === 'sensitiveChannel'" :src="i18n.ts.userSaysSomethingInSensitiveChannel" tag="small">
+		<template #name>
+			<MkA v-user-preview="appearNote.userId" :to="userPage(appearNote.user)">
+				<MkUserName :user="appearNote.user"/>
+			</MkA>
+		</template>
+	</I18n>
 	<I18n v-else-if="showSoftWordMutedWord !== true" :src="i18n.ts.userSaysSomething" tag="small">
 		<template #name>
 			<MkA v-user-preview="appearNote.userId" :to="userPage(appearNote.user)">
@@ -261,6 +268,9 @@ const emit = defineEmits<{
 	(ev: 'removeReaction', emoji: string): void;
 }>();
 
+// for some timelines, like home timeline which only shows the following channels,
+// we never collapse sensitive channel notes so we allow inject to override the preference
+const collapseSensitiveChannelContext = inject(DI.collapseSensitiveChannel, true);
 const inTimeline = inject<boolean>('inTimeline', false);
 const tl_withSensitive = inject<Ref<boolean>>('tl_withSensitive', ref(true));
 const inChannel = inject('inChannel', null);
@@ -330,9 +340,9 @@ const pleaseLoginContext = computed<OpenOnRemoteOptions>(() => ({
 /* eslint-disable no-redeclare */
 /** checkOnlyでは純粋なワードミュート結果をbooleanで返却する */
 function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly: true): boolean;
-function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly?: false): Array<string | string[]> | false | 'sensitiveMute';
+function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly?: false): Array<string | string[]> | false | 'sensitiveMute' | 'sensitiveChannel';
 
-function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly = false): Array<string | string[]> | boolean | 'sensitiveMute' {
+function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly = false): Array<string | string[]> | boolean | 'sensitiveMute' | 'sensitiveChannel' {
 	if (mutedWords != null) {
 		const result = checkWordMute(noteToCheck, $i, mutedWords);
 		if (Array.isArray(result)) {
@@ -352,6 +362,20 @@ function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string
 
 	if (checkOnly) return false;
 
+	if (noteToCheck.channel?.isSensitive) {
+		if (prefer.s.collapseSensitiveChannel) {
+			switch (collapseSensitiveChannelContext) {
+				case true: return 'sensitiveChannel';
+				case 'renote-only':
+					if (note.channel?.id !== appearNote.channel?.id) {
+						return 'sensitiveChannel';
+					}
+					break;
+				case false:
+					break;
+			}
+		}
+	}
 	if (inTimeline && tl_withSensitive.value === false && noteToCheck.files?.some((v) => v.isSensitive)) {
 		return 'sensitiveMute';
 	}
diff --git a/packages/frontend/src/di.ts b/packages/frontend/src/di.ts
index f09782ea38..0069713f38 100644
--- a/packages/frontend/src/di.ts
+++ b/packages/frontend/src/di.ts
@@ -18,4 +18,5 @@ export const DI = {
 	mfmEmojiReactCallback: Symbol() as InjectionKey<(emoji: string) => void>,
 	inModal: Symbol() as InjectionKey<boolean>,
 	inAppSearchMarkerId: Symbol() as InjectionKey<Ref<string | null>>,
+	collapseSensitiveChannel: Symbol() as InjectionKey<boolean | 'renote-only'>,
 };
diff --git a/packages/frontend/src/pages/channel.vue b/packages/frontend/src/pages/channel.vue
index 0879aa72be..1874c1b5b1 100644
--- a/packages/frontend/src/pages/channel.vue
+++ b/packages/frontend/src/pages/channel.vue
@@ -71,7 +71,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, watch, ref, markRaw, shallowRef } from 'vue';
+import { computed, watch, ref, markRaw, shallowRef, provide } from 'vue';
 import * as Misskey from 'misskey-js';
 import { url } from '@@/js/config.js';
 import { useInterval } from '@@/js/use-interval.js';
@@ -99,6 +99,7 @@ import { notesSearchAvailable } from '@/utility/check-permissions.js';
 import { miLocalStorage } from '@/local-storage.js';
 import { useRouter } from '@/router.js';
 import { Paginator } from '@/utility/paginator.js';
+import { DI } from '@/di.js';
 
 const router = useRouter();
 
@@ -106,6 +107,9 @@ const props = defineProps<{
 	channelId: string;
 }>();
 
+// チャンネルタイムラインには目的のチャンネルしか原則表示されないので、折りたたみを無効化する
+provide(DI.collapseSensitiveChannel, false);
+
 const tab = ref('overview');
 
 const channel = ref<Misskey.entities.Channel | null>(null);
diff --git a/packages/frontend/src/pages/notifications.vue b/packages/frontend/src/pages/notifications.vue
index 37ec6284a3..daee26232d 100644
--- a/packages/frontend/src/pages/notifications.vue
+++ b/packages/frontend/src/pages/notifications.vue
@@ -20,7 +20,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, markRaw, ref } from 'vue';
+import { computed, markRaw, provide, ref } from 'vue';
 import { notificationTypes } from 'misskey-js';
 import type { PageHeaderItem } from '@/types/page-header.js';
 import MkStreamingNotificationsTimeline from '@/components/MkStreamingNotificationsTimeline.vue';
@@ -29,11 +29,15 @@ import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
 import { definePage } from '@/page.js';
 import { Paginator } from '@/utility/paginator.js';
+import { DI } from '@/di';
 
 const tab = ref('all');
 const includeTypes = ref<string[] | null>(null);
 const excludeTypes = computed(() => includeTypes.value ? notificationTypes.filter(t => !includeTypes.value!.includes(t)) : null);
 
+// 通知では自分がセンシティブタイムラインにした投稿の反応が表示される可能性があるため、折りたたみを無効化する
+provide(DI.collapseSensitiveChannel, false);
+
 const mentionsPaginator = markRaw(new Paginator('notes/mentions', {
 	limit: 10,
 }));
diff --git a/packages/frontend/src/pages/settings/preferences.vue b/packages/frontend/src/pages/settings/preferences.vue
index 1a613466db..91d3c1703b 100644
--- a/packages/frontend/src/pages/settings/preferences.vue
+++ b/packages/frontend/src/pages/settings/preferences.vue
@@ -244,6 +244,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 										</MkSwitch>
 									</MkPreferenceContainer>
 								</SearchMarker>
+
+								<SearchMarker :keywords="['collapse', 'sensitive', 'channel', 'fold']">
+									<MkPreferenceContainer k="collapseSensitiveChannel">
+										<MkSwitch v-model="collapseSensitiveChannel">
+											<template #label><SearchLabel>{{ i18n.ts.collapseSensitiveChannel }}</SearchLabel></template>
+											<template #caption>{{ i18n.ts.collapseSensitiveChannelDescription }}</template>
+										</MkSwitch>
+									</MkPreferenceContainer>
+								</SearchMarker>
 							</div>
 
 							<SearchMarker :keywords="['reaction', 'size', 'scale', 'display']">
@@ -911,6 +920,7 @@ const showReactionsCount = prefer.model('showReactionsCount');
 const enableQuickAddMfmFunction = prefer.model('enableQuickAddMfmFunction');
 const forceShowAds = prefer.model('forceShowAds');
 const loadRawImages = prefer.model('loadRawImages');
+const collapseSensitiveChannel = prefer.model('collapseSensitiveChannel');
 const imageNewTab = prefer.model('imageNewTab');
 const showFixedPostForm = prefer.model('showFixedPostForm');
 const showFixedPostFormInChannel = prefer.model('showFixedPostFormInChannel');
diff --git a/packages/frontend/src/pages/timeline.vue b/packages/frontend/src/pages/timeline.vue
index 64c2b2eee3..215d03be78 100644
--- a/packages/frontend/src/pages/timeline.vue
+++ b/packages/frontend/src/pages/timeline.vue
@@ -45,9 +45,13 @@ import { deepMerge } from '@/utility/merge.js';
 import { miLocalStorage } from '@/local-storage.js';
 import { availableBasicTimelines, hasWithReplies, isAvailableBasicTimeline, isBasicTimeline, basicTimelineIconClass } from '@/timelines.js';
 import { prefer } from '@/preferences.js';
+import { DI } from '@/di.js';
 
 const tlComponent = useTemplateRef('tlComponent');
 
+// ホームタイムラインにはフォロー中のチャンネル以外の場合に折りたたみを無効化する。
+provide(DI.collapseSensitiveChannel, 'renote-only');
+
 type TimelinePageSrc = BasicTimelineType | `list:${string}`;
 
 const srcWhenNotSignin = ref<'local' | 'global'>(isAvailableBasicTimeline('local') ? 'local' : 'global');
diff --git a/packages/frontend/src/preferences/def.ts b/packages/frontend/src/preferences/def.ts
index b33b53b83c..e4a91a0d59 100644
--- a/packages/frontend/src/preferences/def.ts
+++ b/packages/frontend/src/preferences/def.ts
@@ -209,6 +209,9 @@ export const PREF_DEF = definePreferences({
 	nsfw: {
 		default: 'respect' as 'respect' | 'force' | 'ignore',
 	},
+	collapseSensitiveChannel: {
+		default: true,
+	},
 	highlightSensitiveMedia: {
 		default: false,
 	},
diff --git a/packages/frontend/src/ui/deck/channel-column.vue b/packages/frontend/src/ui/deck/channel-column.vue
index dd14e7019e..3664c44809 100644
--- a/packages/frontend/src/ui/deck/channel-column.vue
+++ b/packages/frontend/src/ui/deck/channel-column.vue
@@ -19,7 +19,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { onMounted, ref, shallowRef, watch, useTemplateRef } from 'vue';
+import { onMounted, ref, shallowRef, watch, useTemplateRef, provide } from 'vue';
 import * as Misskey from 'misskey-js';
 import XColumn from './column.vue';
 import type { Column } from '@/deck.js';
@@ -33,12 +33,16 @@ import { favoritedChannelsCache } from '@/cache.js';
 import { misskeyApi } from '@/utility/misskey-api.js';
 import { i18n } from '@/i18n.js';
 import { soundSettingsButton } from '@/ui/deck/tl-note-notification.js';
+import { DI } from '@/di.js';
 
 const props = defineProps<{
 	column: Column;
 	isStacked: boolean;
 }>();
 
+// チャンネルタイムラインには目的のチャンネルしか原則表示されないので、折りたたみを無効化する
+provide(DI.collapseSensitiveChannel, false);
+
 const timeline = useTemplateRef('timeline');
 const channel = shallowRef<Misskey.entities.Channel>();
 const soundSetting = ref<SoundStore>(props.column.soundSetting ?? { type: null, volume: 1 });
diff --git a/packages/frontend/src/ui/deck/notifications-column.vue b/packages/frontend/src/ui/deck/notifications-column.vue
index 469e9472ab..aefe29c1d0 100644
--- a/packages/frontend/src/ui/deck/notifications-column.vue
+++ b/packages/frontend/src/ui/deck/notifications-column.vue
@@ -12,19 +12,23 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { defineAsyncComponent, useTemplateRef } from 'vue';
+import { defineAsyncComponent, provide, useTemplateRef } from 'vue';
 import XColumn from './column.vue';
 import type { Column } from '@/deck.js';
 import { updateColumn } from '@/deck.js';
 import MkStreamingNotificationsTimeline from '@/components/MkStreamingNotificationsTimeline.vue';
 import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
+import { DI } from '@/di.js';
 
 const props = defineProps<{
 	column: Column;
 	isStacked: boolean;
 }>();
 
+// 通知では自分がセンシティブタイムラインにした投稿の反応が表示される可能性があるため、折りたたみを無効化する
+provide(DI.collapseSensitiveChannel, false);
+
 const notificationsComponent = useTemplateRef('notificationsComponent');
 
 async function func() {
diff --git a/packages/frontend/src/ui/deck/tl-column.vue b/packages/frontend/src/ui/deck/tl-column.vue
index aab0cde1c8..4972441299 100644
--- a/packages/frontend/src/ui/deck/tl-column.vue
+++ b/packages/frontend/src/ui/deck/tl-column.vue
@@ -33,7 +33,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { onMounted, watch, ref, useTemplateRef, computed } from 'vue';
+import { onMounted, watch, ref, useTemplateRef, computed, provide } from 'vue';
 import XColumn from './column.vue';
 import type { Column } from '@/deck.js';
 import type { MenuItem } from '@/types/menu.js';
@@ -44,12 +44,16 @@ import * as os from '@/os.js';
 import { i18n } from '@/i18n.js';
 import { hasWithReplies, isAvailableBasicTimeline, basicTimelineIconClass } from '@/timelines.js';
 import { soundSettingsButton } from '@/ui/deck/tl-note-notification.js';
+import { DI } from '@/di.js';
 
 const props = defineProps<{
 	column: Column;
 	isStacked: boolean;
 }>();
 
+// ホームタイムラインにはフォロー中のチャンネルし以外の場合に折りたたみを無効化する。
+provide(DI.collapseSensitiveChannel, 'renote-only');
+
 const timeline = useTemplateRef('timeline');
 
 const soundSetting = ref<SoundStore>(props.column.soundSetting ?? { type: null, volume: 1 });
diff --git a/packages/i18n/src/autogen/locale.ts b/packages/i18n/src/autogen/locale.ts
index f814f3ecc2..d66d8fbf16 100644
--- a/packages/i18n/src/autogen/locale.ts
+++ b/packages/i18n/src/autogen/locale.ts
@@ -3372,6 +3372,14 @@ export interface Locale extends ILocale {
      * 右クリックでリアクションピッカーを開く
      */
     "useReactionPickerForContextMenu": string;
+    /**
+     * センシティブチャンネルの投稿を隠す
+     */
+    "collapseSensitiveChannel": string;
+    /**
+     * そのチャンネル内・通知・ホームタイムラインなど、一部の場所では引き続き表示されます。
+     */
+    "collapseSensitiveChannelDescription": string;
     /**
      * {users}が入力中
      */
@@ -5140,6 +5148,10 @@ export interface Locale extends ILocale {
      * {name}のセンシティブなファイルを含む投稿
      */
     "userSaysSomethingSensitive": ParameterizedString<"name">;
+    /**
+     * {name}のセンシティブチャンネルでの投稿
+     */
+    "userSaysSomethingInSensitiveChannel": ParameterizedString<"name">;
     /**
      * スワイプしてタブを切り替える
      */