diff --git a/apps/web/__tests__/unit/delete-comment-notifications.test.ts b/apps/web/__tests__/unit/delete-comment-notifications.test.ts
new file mode 100644
index 00000000000..e4b9e032b80
--- /dev/null
+++ b/apps/web/__tests__/unit/delete-comment-notifications.test.ts
@@ -0,0 +1,112 @@
+import { Comment, Video } from "@cap/web-domain";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const mocks = vi.hoisted(() => ({
+	query: vi.fn(),
+	getCurrentUser: vi.fn(),
+	revalidatePath: vi.fn(),
+}));
+
+vi.mock("@cap/database", async () => {
+	const { drizzle } = await import("drizzle-orm/mysql-proxy");
+	const client = drizzle(mocks.query);
+	return {
+		db: () => ({
+			transaction: <T>(callback: (tx: typeof client) => Promise<T>) =>
+				callback(client),
+		}),
+	};
+});
+vi.mock("@cap/database/auth/session", () => ({
+	getCurrentUser: mocks.getCurrentUser,
+}));
+vi.mock("@cap/web-backend", () => ({ Storage: {}, VideosRepo: {} }));
+vi.mock("@/lib/server", () => ({}));
+vi.mock("next/cache", () => ({ revalidatePath: mocks.revalidatePath }));
+
+import { deleteComment } from "@/actions/videos/delete-comment";
+
+const commentId = Comment.CommentId.make("reaction");
+const videoId = Video.VideoId.make("video");
+
+beforeEach(() => {
+	mocks.getCurrentUser.mockResolvedValue({ id: "viewer" });
+	mocks.query.mockReset();
+	mocks.query.mockResolvedValue({ rows: [{ affectedRows: 1, insertId: 0 }] });
+	mocks.query.mockResolvedValueOnce({
+		rows: [[commentId, videoId, null, null]],
+	});
+});
+
+describe("deleted comment notifications", () => {
+	it.each([null, Comment.CommentId.make("")])(
+		"removes the reaction notification for a root with parent %j",
+		async (parentId) => {
+			await expect(
+				deleteComment({ commentId, videoId, parentId }),
+			).resolves.toEqual({ success: true });
+
+			expect(mocks.query).toHaveBeenCalledWith(
+				expect.stringContaining("delete from `comments`"),
+				[commentId, "viewer"],
+				"execute",
+			);
+			expect(mocks.query).toHaveBeenCalledWith(
+				expect.stringContaining(
+					"where (`notifications`.`type` in (?, ?) and JSON_EXTRACT(`notifications`.`data`, '$.comment.id') = ?)",
+				),
+				["comment", "reaction", commentId],
+				"execute",
+			);
+			expect(mocks.revalidatePath).toHaveBeenCalledWith(`/s/${videoId}`);
+		},
+	);
+
+	it("removes reply notifications for replies to a deleted root", async () => {
+		await deleteComment({ commentId, videoId, parentId: null });
+
+		expect(mocks.query).toHaveBeenCalledWith(
+			expect.stringContaining(
+				"where (`notifications`.`type` = ? and JSON_EXTRACT(`notifications`.`data`, '$.parentCommentId') = ?)",
+			),
+			["reply", commentId],
+			"execute",
+		);
+	});
+
+	it("still removes only the reply notification when deleting a reply", async () => {
+		await deleteComment({
+			commentId,
+			videoId,
+			parentId: Comment.CommentId.make("parent"),
+		});
+
+		const deletes = mocks.query.mock.calls.filter(([query]) =>
+			query.startsWith("delete from `notifications`"),
+		);
+		expect(deletes).toEqual([
+			[
+				expect.stringContaining("'$.comment.id'"),
+				["reply", commentId],
+				"execute",
+			],
+		]);
+	});
+
+	it("does not delete notifications for a missing or unowned comment", async () => {
+		mocks.query.mockReset();
+		mocks.query.mockResolvedValue({ rows: [] });
+		vi.spyOn(console, "error").mockImplementation(() => {});
+
+		await expect(
+			deleteComment({ commentId, videoId, parentId: null }),
+		).rejects.toThrow("Comment not found or you don't have permission");
+
+		expect(mocks.query).toHaveBeenCalledExactlyOnceWith(
+			expect.stringContaining("`comments`.`authorId` = ?"),
+			[commentId, "viewer", 1],
+			"all",
+		);
+		expect(mocks.revalidatePath).not.toHaveBeenCalled();
+	});
+});
diff --git a/apps/web/__tests__/unit/reply-notification.test.ts b/apps/web/__tests__/unit/reply-notification.test.ts
index 4202e92c752..01cad3820b0 100644
--- a/apps/web/__tests__/unit/reply-notification.test.ts
+++ b/apps/web/__tests__/unit/reply-notification.test.ts
@@ -81,6 +81,13 @@ describe("reply notifications", () => {
 			expect(inserts[0]?.[1]).toEqual(
 				expect.arrayContaining(["comment-author", "reply-org", "reply"]),
 			);
+			const data = inserts[0]?.[1].find(
+				(param: unknown) => typeof param === "string" && param.startsWith("{"),
+			);
+			expect(JSON.parse(data)).toMatchObject({
+				comment: { id: "reply" },
+				parentCommentId: "parent",
+			});
 			expect(mocks.sendEmail).not.toHaveBeenCalled();
 		},
 	);
diff --git a/apps/web/actions/videos/delete-comment.ts b/apps/web/actions/videos/delete-comment.ts
index 29b14bb49ad..397f1258a1a 100644
--- a/apps/web/actions/videos/delete-comment.ts
+++ b/apps/web/actions/videos/delete-comment.ts
@@ -5,7 +5,7 @@ import { getCurrentUser } from "@cap/database/auth/session";
 import { comments, notifications } from "@cap/database/schema";
 import { Storage, VideosRepo } from "@cap/web-backend";
 import type { Comment, Video } from "@cap/web-domain";
-import { and, eq, sql } from "drizzle-orm";
+import { and, eq, inArray, sql } from "drizzle-orm";
 import { Effect, Option } from "effect";
 import { revalidatePath } from "next/cache";
 import * as EffectRuntime from "@/lib/server";
@@ -84,7 +84,7 @@ export async function deleteComment({
 					.delete(notifications)
 					.where(
 						and(
-							eq(notifications.type, "comment"),
+							inArray(notifications.type, ["comment", "reaction"]),
 							sql`JSON_EXTRACT(${notifications.data}, '$.comment.id') = ${commentId}`,
 						),
 					);
@@ -94,7 +94,7 @@ export async function deleteComment({
 					.where(
 						and(
 							eq(notifications.type, "reply"),
-							sql`JSON_EXTRACT(${notifications.data}, '$.comment.parentCommentId') = ${commentId}`,
+							sql`JSON_EXTRACT(${notifications.data}, '$.parentCommentId') = ${commentId}`,
 						),
 					);
 			}
diff --git a/apps/web/app/api/mobile/[...route]/route.ts b/apps/web/app/api/mobile/[...route]/route.ts
index 6cdbe00c1ad..0480b5420f3 100644
--- a/apps/web/app/api/mobile/[...route]/route.ts
+++ b/apps/web/app/api/mobile/[...route]/route.ts
@@ -3778,7 +3778,7 @@ const ApiLive = HttpApiBuilder.api(Mobile.MobileApiContract).pipe(
 												.where(
 													and(
 														eq(Db.notifications.type, "reply"),
-														sql`JSON_EXTRACT(${Db.notifications.data}, '$.comment.parentCommentId') = ${path.id}`,
+														sql`JSON_EXTRACT(${Db.notifications.data}, '$.parentCommentId') = ${path.id}`,
 													),
 												);
 										}