diff --git a/lib/private/User/GetQuotaEvent.php b/lib/private/User/GetQuotaEvent.php
new file mode 100644
index 0000000000000..ba27f9dd08f2f
--- /dev/null
+++ b/lib/private/User/GetQuotaEvent.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\User;
+
+use OCP\EventDispatcher\Event;
+use OCP\IUser;
+
+/**
+ * Event to allow apps to
+ */
+class GetQuotaEvent extends Event {
+	/** @var IUser */
+	private $user;
+	/** @var string|null */
+	private $quota = null;
+
+	public function __construct(IUser $user) {
+		parent::__construct();
+		$this->user = $user;
+	}
+
+	public function getUser(): IUser {
+		return $this->user;
+	}
+
+	/**
+	 * Get the set quota as human readable string, or null if no overwrite is set
+	 *
+	 * @return string|null
+	 */
+	public function getQuota(): ?string {
+		return $this->quota;
+	}
+
+	/**
+	 * Set the quota overwrite as human readable string
+	 *
+	 * @param string $quota
+	 */
+	public function setQuota(string $quota): void {
+		$this->quota = $quota;
+	}
+}
diff --git a/lib/private/User/User.php b/lib/private/User/User.php
index 2d27b204d090b..83632d1beb911 100644
--- a/lib/private/User/User.php
+++ b/lib/private/User/User.php
@@ -406,7 +406,15 @@ public function getEMailAddress() {
 	 * @since 9.0.0
 	 */
 	public function getQuota() {
-		$quota = $this->config->getUserValue($this->uid, 'files', 'quota', 'default');
+		// allow apps to modify the user quota by hooking into the event
+		$event = new GetQuotaEvent($this);
+		$this->dispatcher->dispatchTyped($event);
+		$overwriteQuota = $event->getQuota();
+		if ($overwriteQuota) {
+			$quota = $overwriteQuota;
+		} else {
+			$quota = $this->config->getUserValue($this->uid, 'files', 'quota', 'default');
+		}
 		if ($quota === 'default') {
 			$quota = $this->config->getAppValue('files', 'default_quota', 'none');
 		}