diff --git a/api/src/services/roles.ts b/api/src/services/roles.ts
index 51dbfc457c..e3556eb3f8 100644
--- a/api/src/services/roles.ts
+++ b/api/src/services/roles.ts
@@ -24,7 +24,7 @@ export class RolesService extends ItemsService {
 			.first();
 		const otherAdminRolesCount = +(otherAdminRoles?.count || 0);
 		if (otherAdminRolesCount === 0)
-			throw new UnprocessableEntityException('You have to have at least one admin role.');
+			throw new UnprocessableEntityException(`You can't delete the last admin role.`);
 
 		// Remove all permissions associated with this role
 		const permissionsService = new PermissionsService({
diff --git a/api/src/services/users.ts b/api/src/services/users.ts
index 56f600049d..d2ccdcd6bb 100644
--- a/api/src/services/users.ts
+++ b/api/src/services/users.ts
@@ -4,7 +4,11 @@ import jwt from 'jsonwebtoken';
 import { sendInviteMail, sendPasswordResetMail } from '../mail';
 import database from '../database';
 import argon2 from 'argon2';
-import { InvalidPayloadException, ForbiddenException } from '../exceptions';
+import {
+	InvalidPayloadException,
+	ForbiddenException,
+	UnprocessableEntityException,
+} from '../exceptions';
 import { Accountability, PrimaryKey, Item, AbstractServiceOptions } from '../types';
 import Knex from 'knex';
 import env from '../env';
@@ -50,6 +54,30 @@ export class UsersService extends ItemsService {
 		return this.service.update(data, key as any);
 	}
 
+	delete(key: PrimaryKey): Promise<PrimaryKey>;
+	delete(keys: PrimaryKey[]): Promise<PrimaryKey[]>;
+	async delete(key: PrimaryKey | PrimaryKey[]): Promise<PrimaryKey | PrimaryKey[]> {
+		const keys = Array.isArray(key) ? key : [key];
+
+		// Make sure there's at least one admin user left after this deletion is done
+		const otherAdminUsers = await this.knex
+			.count('*', { as: 'count' })
+			.from('directus_users')
+			.whereNotIn('directus_users.id', keys)
+			.andWhere({ 'directus_roles.admin_access': true })
+			.leftJoin('directus_roles', 'directus_users.role', 'directus_roles.id')
+			.first();
+
+		const otherAdminUsersCount = +(otherAdminUsers?.count || 0);
+
+		if (otherAdminUsersCount === 0)
+			throw new UnprocessableEntityException(`You can't delete the last admin user.`);
+
+		await super.delete(keys as any);
+
+		return key;
+	}
+
 	async inviteUser(email: string, role: string) {
 		await this.service.create({ email, role, status: 'invited' });