diff --git a/packages/backend/src/server/api/stream/channels/global-timeline.ts b/packages/backend/src/server/api/stream/channels/global-timeline.ts
index ed56fe0d40..c78cdec2a9 100644
--- a/packages/backend/src/server/api/stream/channels/global-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/global-timeline.ts
@@ -19,6 +19,7 @@ class GlobalTimelineChannel extends Channel {
 	public static requireCredential = false as const;
 	private withRenotes: boolean;
 	private withFiles: boolean;
+	private withCats: boolean;
 
 	constructor(
 		private metaService: MetaService,
@@ -39,6 +40,7 @@ class GlobalTimelineChannel extends Channel {
 
 		this.withRenotes = !!(params.withRenotes ?? true);
 		this.withFiles = !!(params.withFiles ?? false);
+		this.withCats = !!(params.withCats ?? false);
 
 		// Subscribe events
 		this.subscriber.on('notesStream', this.onNote);
@@ -47,6 +49,7 @@ class GlobalTimelineChannel extends Channel {
 	@bindThis
 	private async onNote(note: Packed<'Note'>) {
 		if (this.withFiles && (note.fileIds == null || note.fileIds.length === 0)) return;
+		if (this.withCats && (note.user.isCat == null || note.user.isCat === false)) return;
 
 		if (note.visibility !== 'public') return;
 		if (note.channelId != null) return;
diff --git a/packages/backend/src/server/api/stream/channels/home-timeline.ts b/packages/backend/src/server/api/stream/channels/home-timeline.ts
index 66644ed58c..0c6f4f3a1b 100644
--- a/packages/backend/src/server/api/stream/channels/home-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/home-timeline.ts
@@ -18,6 +18,7 @@ class HomeTimelineChannel extends Channel {
 	public static kind = 'read:account';
 	private withRenotes: boolean;
 	private withFiles: boolean;
+	private withCats: boolean;
 
 	constructor(
 		private noteEntityService: NoteEntityService,
@@ -33,6 +34,7 @@ class HomeTimelineChannel extends Channel {
 	public async init(params: JsonObject) {
 		this.withRenotes = !!(params.withRenotes ?? true);
 		this.withFiles = !!(params.withFiles ?? false);
+		this.withCats = !!(params.withCats ?? false);
 
 		this.subscriber.on('notesStream', this.onNote);
 	}
@@ -42,6 +44,7 @@ class HomeTimelineChannel extends Channel {
 		const isMe = this.user!.id === note.userId;
 
 		if (this.withFiles && (note.fileIds == null || note.fileIds.length === 0)) return;
+		if (this.withCats && (note.user.isCat == null || note.user.isCat === false)) return;
 
 		if (note.channelId) {
 			if (!this.followingChannels.has(note.channelId)) return;
diff --git a/packages/backend/src/server/api/stream/channels/hybrid-timeline.ts b/packages/backend/src/server/api/stream/channels/hybrid-timeline.ts
index 5681311493..9d01efcb7f 100644
--- a/packages/backend/src/server/api/stream/channels/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/hybrid-timeline.ts
@@ -21,6 +21,7 @@ class HybridTimelineChannel extends Channel {
 	private withRenotes: boolean;
 	private withReplies: boolean;
 	private withFiles: boolean;
+	private withCats: boolean;
 
 	constructor(
 		private metaService: MetaService,
@@ -42,6 +43,7 @@ class HybridTimelineChannel extends Channel {
 		this.withRenotes = !!(params.withRenotes ?? true);
 		this.withReplies = !!(params.withReplies ?? false);
 		this.withFiles = !!(params.withFiles ?? false);
+		this.withCats = !!(params.withCats ?? false);
 
 		// Subscribe events
 		this.subscriber.on('notesStream', this.onNote);
@@ -52,6 +54,7 @@ class HybridTimelineChannel extends Channel {
 		const isMe = this.user!.id === note.userId;
 
 		if (this.withFiles && (note.fileIds == null || note.fileIds.length === 0)) return;
+		if (this.withCats && (note.user.isCat == null || note.user.isCat === false)) return;
 
 		// チャンネルの投稿ではなく、自分自身の投稿 または
 		// チャンネルの投稿ではなく、その投稿のユーザーをフォローしている または
diff --git a/packages/backend/src/server/api/stream/channels/local-timeline.ts b/packages/backend/src/server/api/stream/channels/local-timeline.ts
index 491029f5de..0e79ddd88c 100644
--- a/packages/backend/src/server/api/stream/channels/local-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/local-timeline.ts
@@ -20,6 +20,7 @@ class LocalTimelineChannel extends Channel {
 	private withRenotes: boolean;
 	private withReplies: boolean;
 	private withFiles: boolean;
+	private withCats: boolean;
 
 	constructor(
 		private metaService: MetaService,
@@ -41,6 +42,7 @@ class LocalTimelineChannel extends Channel {
 		this.withRenotes = !!(params.withRenotes ?? true);
 		this.withReplies = !!(params.withReplies ?? false);
 		this.withFiles = !!(params.withFiles ?? false);
+		this.withCats = !!(params.withCats ?? false);
 
 		// Subscribe events
 		this.subscriber.on('notesStream', this.onNote);
@@ -49,6 +51,7 @@ class LocalTimelineChannel extends Channel {
 	@bindThis
 	private async onNote(note: Packed<'Note'>) {
 		if (this.withFiles && (note.fileIds == null || note.fileIds.length === 0)) return;
+		if (this.withCats && (note.user.isCat == null || note.user.isCat === false)) return;
 
 		if (note.user.host !== null) return;
 		if (note.visibility !== 'public') return;
diff --git a/packages/backend/test/e2e/streaming.ts b/packages/backend/test/e2e/streaming.ts
index 76bf10cf66..4316756f1c 100644
--- a/packages/backend/test/e2e/streaming.ts
+++ b/packages/backend/test/e2e/streaming.ts
@@ -7,9 +7,9 @@ process.env.NODE_ENV = 'test';
 
 import * as assert from 'assert';
 import { WebSocket } from 'ws';
-import { MiFollowing } from '@/models/Following.js';
 import { api, createAppToken, initTestDb, port, post, signup, waitFire } from '../utils.js';
 import type * as misskey from 'cherrypick-js';
+import { MiFollowing } from '@/models/Following.js';
 
 describe('Streaming', () => {
 	let Followings: any;
@@ -306,6 +306,33 @@ describe('Streaming', () => {
 				assert.strictEqual(fired, true);
 			});
 
+			test('withCats: true のときノートが流れる', async () => {
+				await api('i/update', {
+					isCat: true,
+				}, kyoko);
+				const fired = await waitFire(
+					ayano, 'homeTimeline',	// ayano:home
+					() => api('notes/create', { text: 'meow' }, kyoko),	// cat kyoko note
+					msg => msg.type === 'note' && msg.body.userId === kyoko.id,	// wait kyoko
+					{ withCats: true },
+				);
+
+				assert.strictEqual(fired, true);
+				await api('i/update', {
+					isCat: false,
+				}, kyoko);
+			});
+
+			test('withCats: true のときノートが流れない', async () => {
+				const fired = await waitFire(
+					ayano, 'homeTimeline',	// ayano:home
+					() => api('notes/create', { text: 'test' }, kyoko),	// kyoko note
+					msg => msg.type === 'note' && msg.body.userId === kyoko.id,	// wait kyoko
+					{ withCats: true },
+				);
+
+				assert.strictEqual(fired, false);
+			});
 			test('withReplies: true のとき自分のfollowers投稿に対するリプライが流れる', async () => {
 				const erinNote = await post(erin, { text: 'hi', visibility: 'followers' });
 				const fired = await waitFire(