diff --git a/packages/backend/src/server/api/common/getters.ts b/packages/backend/src/server/api/common/getters.ts
index cc15a932b..a34d8ac1c 100644
--- a/packages/backend/src/server/api/common/getters.ts
+++ b/packages/backend/src/server/api/common/getters.ts
@@ -1,3 +1,4 @@
+import { IsNull, Not } from 'typeorm';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { User } from '@/models/entities/user.js';
 import { Note } from '@/models/entities/note.js';
@@ -28,8 +29,12 @@ export async function getNote(noteId: Note['id'], me: { id: User['id'] } | null)
 /**
  * Get user for API processing
  */
-export async function getUser(userId: User['id']) {
-	const user = await Users.findOneBy({ id: userId });
+export async function getUser(userId: User['id'], includeSuspended = false) {
+	const user = await Users.findOneBy(
+		id: userId,
+		isDeleted: false,
+		isSuspended: !includeSuspended,
+	});
 
 	if (user == null) {
 		throw new ApiError('NO_SUCH_USER');
@@ -41,10 +46,15 @@ export async function getUser(userId: User['id']) {
 /**
  * Get remote user for API processing
  */
-export async function getRemoteUser(userId: User['id']) {
-	const user = await getUser(userId);
+export async function getRemoteUser(userId: User['id'], includeSuspended = false) {
+	const user = await Users.findOneBy(
+		id: userId,
+		host: Not(IsNull()),
+		isDeleted: false,
+		isSuspended: !includedSuspended,
+	});
 
-	if (!Users.isRemoteUser(user)) {
+	if (user == null) {
 		throw new ApiError('NO_SUCH_USER');
 	}
 
@@ -54,10 +64,15 @@ export async function getRemoteUser(userId: User['id']) {
 /**
  * Get local user for API processing
  */
-export async function getLocalUser(userId: User['id']) {
-	const user = await getUser(userId);
+export async function getLocalUser(userId: User['id'], includeSuspended = false) {
+	const user = await Users.findOneBy(
+		id: userId,
+		host: IsNull(),
+		isDeleted: false,
+		isSuspended: !includeSuspended,
+	});
 
-	if (!Users.isLocalUser(user)) {
+	if (user == null) {
 		throw new ApiError('NO_SUCH_USER');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/admin/users/delete.ts b/packages/backend/src/server/api/endpoints/admin/users/delete.ts
index 6445accb9..9112f50f5 100644
--- a/packages/backend/src/server/api/endpoints/admin/users/delete.ts
+++ b/packages/backend/src/server/api/endpoints/admin/users/delete.ts
@@ -2,6 +2,7 @@ import { Users } from '@/models/index.js';
 import { ApiError } from '@/server/api/error.js';
 import { deleteAccount } from '@/services/delete-account.js';
 import define from '@/server/api/define.js';
+import { getUser } from '@/server/api/common/getters.js';
 
 export const meta = {
 	tags: ['admin'],
@@ -22,14 +23,9 @@ export const paramDef = {
 
 // eslint-disable-next-line import/no-default-export
 export default define(meta, paramDef, async (ps) => {
-	const user = await Users.findOneBy({
-		id: ps.userId,
-		isDeleted: false,
-	});
+	const user = await getUser(ps.userId, true);
 
-	if (user == null) {
-		throw new ApiError('NO_SUCH_USER');
-	} else if (user.isAdmin) {
+	if (user.isAdmin) {
 		throw new ApiError('IS_ADMIN');
 	} else if (user.isModerator) {
 		throw new ApiError('IS_MODERATOR');
diff --git a/packages/backend/src/server/api/private/signin.ts b/packages/backend/src/server/api/private/signin.ts
index 2f4a3ca47..b09262bb1 100644
--- a/packages/backend/src/server/api/private/signin.ts
+++ b/packages/backend/src/server/api/private/signin.ts
@@ -47,6 +47,7 @@ export default async (ctx: Koa.Context) => {
 	const user = await Users.findOneBy({
 		usernameLower: username.toLowerCase(),
 		host: IsNull(),
+		isDeleted: false,
 	}) as ILocalUser;
 
 	if (user == null) {
diff --git a/packages/backend/src/server/web/index.ts b/packages/backend/src/server/web/index.ts
index fec6663fa..7fe462d43 100644
--- a/packages/backend/src/server/web/index.ts
+++ b/packages/backend/src/server/web/index.ts
@@ -223,6 +223,7 @@ const getFeed = async (acct: string) => {
 		usernameLower: username.toLowerCase(),
 		host: host ?? IsNull(),
 		isSuspended: false,
+		isDeleted: false,
 	});
 
 	return user && await packFeed(user);
@@ -272,6 +273,7 @@ router.get(['/@:user', '/@:user/:sub'], async (ctx, next) => {
 		usernameLower: username.toLowerCase(),
 		host: host ?? IsNull(),
 		isSuspended: false,
+		isDeleted: false,
 	});
 
 	if (user != null) {
@@ -304,6 +306,7 @@ router.get('/users/:user', async ctx => {
 		id: ctx.params.user,
 		host: IsNull(),
 		isSuspended: false,
+		isDeleted: false,
 	});
 
 	if (user == null) {
@@ -419,6 +422,8 @@ router.get('/@:user/pages/:page', async (ctx, next) => {
 	const user = await Users.findOneBy({
 		usernameLower: username.toLowerCase(),
 		host: host ?? IsNull(),
+		isSuspended: false,
+		isDeleted: false,
 	});
 
 	if (user == null) return;
diff --git a/packages/backend/src/services/delete-account.ts b/packages/backend/src/services/delete-account.ts
index 9c8d4c277..2fa6e004b 100644
--- a/packages/backend/src/services/delete-account.ts
+++ b/packages/backend/src/services/delete-account.ts
@@ -1,4 +1,4 @@
-import { Users } from '@/models/index.js';
+import { AccessTokens, Users } from '@/models/index.js';
 import { createDeleteAccountJob } from '@/queue/index.js';
 import { publishUserEvent } from './stream.js';
 import { doPostSuspend } from './suspend-user.js';
@@ -7,9 +7,15 @@ export async function deleteAccount(user: {
 	id: string;
 	host: string | null;
 }): Promise<void> {
-	await Users.update(user.id, {
-		isDeleted: true,
-	});
+	await Promise.all([
+		Users.update(user.id, {
+			isDeleted: true,
+		}),
+		// revoke all of the users access tokens to block API access
+		AccessTokens.delete({
+			userId: user.id,
+		}),
+	]);
 
 	if (Users.isLocalUser(user)) {
 		// Terminate streaming
diff --git a/packages/backend/src/services/user-cache.ts b/packages/backend/src/services/user-cache.ts
index 31a95ffe6..b4bbb6f1a 100644
--- a/packages/backend/src/services/user-cache.ts
+++ b/packages/backend/src/services/user-cache.ts
@@ -6,15 +6,15 @@ import { subscriber } from '@/db/redis.js';
 
 export const userByIdCache = new Cache<User>(
 	Infinity,
-	async (id) => await Users.findOneBy({ id }) ?? undefined,
+	async (id) => await Users.findOneBy({ id, isDeleted: false }) ?? undefined,
 );
 export const localUserByNativeTokenCache = new Cache<CacheableLocalUser>(
 	Infinity,
-	async (token) => await Users.findOneBy({ token, host: IsNull() }) as ILocalUser | null ?? undefined,
+	async (token) => await Users.findOneBy({ token, host: IsNull(), isDeleted: false }) as ILocalUser | null ?? undefined,
 );
 export const uriPersonCache = new Cache<User>(
 	Infinity,
-	async (uri) => await Users.findOneBy({ uri }) ?? undefined,
+	async (uri) => await Users.findOneBy({ uri, isDeleted: false }) ?? undefined,
 );
 
 subscriber.on('message', async (_, data) => {
@@ -28,14 +28,18 @@ subscriber.on('message', async (_, data) => {
 			case 'userChangeModeratorState':
 			case 'remoteUserUpdated': {
 				const user = await Users.findOneByOrFail({ id: body.id });
-				userByIdCache.set(user.id, user);
-				for (const [k, v] of uriPersonCache.cache.entries()) {
-					if (v.value.id === user.id) {
-						uriPersonCache.set(k, user);
+				if (user.isDeleted) {
+					userByIdCache.delete(user.id);
+					uriPersonCache.delete(user.uri);
+					if (Users.isLocalUser(user)) {
+						localUserByNativeTokenCache.delete(user.token);
+					}
+				} else {
+					userByIdCache.set(user.id, user);
+					uriPersonCache.set(user.uri, user);
+					if (Users.isLocalUser(user)) {
+						localUserByNativeTokenCache.set(user.token, user);
 					}
-				}
-				if (Users.isLocalUser(user)) {
-					localUserByNativeTokenCache.set(user.token, user);
 				}
 				break;
 			}