diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5bb2dfc165..18f09976fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,7 @@ v2025.12.0で行われた「configの`trustProxy`のデフォルト値を`false`
 
 ### Client
 - Fix: バージョン表記のないPlayが正しく動作しない問題を修正
-
+- 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になりました
 
 ## 2025.12.1
 
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 8e4a52b68d..664bb89178 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -839,6 +839,7 @@ 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: "ほとんどのタイムラインでセンシティブチャンネルの投稿を隠す"
 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"
@@ -1281,6 +1282,7 @@ 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 a7299d2961..a7c28ea4c9 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 collapseSensitiveChannel: boolean = inject<boolean | undefined>('collapseSensitiveChannel', undefined) ?? prefer.s.collapseSensitiveChannel;
 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 +362,7 @@ function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string
 
 	if (checkOnly) return false;
 
+	if (collapseSensitiveChannel && noteToCheck.channel?.isSensitive) return 'sensitiveChannel';
 	if (inTimeline && tl_withSensitive.value === false && noteToCheck.files?.some((v) => v.isSensitive)) {
 		return 'sensitiveMute';
 	}
diff --git a/packages/frontend/src/pages/channel.vue b/packages/frontend/src/pages/channel.vue
index 0879aa72be..22426e9cc4 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';
@@ -106,6 +106,9 @@ 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('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 5d308e6b29..902e73cd20 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 MkStreamingNotificationsTimeline from '@/components/MkStreamingNotificationsTimeline.vue';
 import MkNotesTimeline from '@/components/MkNotesTimeline.vue';
@@ -33,6 +33,9 @@ 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('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 972b50f8cd..50fac2a322 100644
--- a/packages/frontend/src/pages/settings/preferences.vue
+++ b/packages/frontend/src/pages/settings/preferences.vue
@@ -236,6 +236,14 @@ 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>
+										</MkSwitch>
+									</MkPreferenceContainer>
+								</SearchMarker>
 							</div>
 
 							<SearchMarker :keywords="['reaction', 'size', 'scale', 'display']">
@@ -871,6 +879,7 @@ 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 89d0991bc0..03eab206c7 100644
--- a/packages/frontend/src/pages/timeline.vue
+++ b/packages/frontend/src/pages/timeline.vue
@@ -47,6 +47,9 @@ import { prefer } from '@/preferences.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しか原則表示されないので、折りたたみを無効化する
+provide('collapseSensitiveChannel', false);
+
 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 8d1d33977d..b087b8cb9e 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..6a87166c4b 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';
@@ -39,6 +39,9 @@ const props = defineProps<{
 	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('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..b750fd6372 100644
--- a/packages/frontend/src/ui/deck/notifications-column.vue
+++ b/packages/frontend/src/ui/deck/notifications-column.vue
@@ -12,7 +12,7 @@ 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';
@@ -25,6 +25,9 @@ const props = defineProps<{
 	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('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 0e59913c4c..171f75ebcf 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';
@@ -50,6 +50,9 @@ const props = defineProps<{
 	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か原則表示されないので、折りたたみを無効化する
+provide('collapseSensitiveChannel', false);
+
 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 8f94aab555..fb5b577083 100644
--- a/packages/i18n/src/autogen/locale.ts
+++ b/packages/i18n/src/autogen/locale.ts
@@ -3368,6 +3368,10 @@ 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;
+    /**
+     * ほとんどのタイムラインでセンシティブチャンネルの投稿を隠す
+     */
+    "collapseSensitiveChannel": string;
     /**
      * {users}が入力中
      */
@@ -5136,6 +5140,10 @@ 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
      */