diff --git a/.env b/.env
index 76d11b73dc7..609e21b05ea 100644
--- a/.env
+++ b/.env
@@ -136,4 +136,6 @@ ENABLE_ASSISTANTS=false #set to true to enable assistants feature
 
 ALTERNATIVE_REDIRECT_URLS=`[]` #valide alternative redirect URL for OAuth
 
-WEBHOOK_URL_REPORT_ASSISTANT=#provide webhook url to get notified when an assistant gets reported
\ No newline at end of file
+WEBHOOK_URL_REPORT_ASSISTANT=#provide webhook url to get notified when an assistant gets reported
+
+ALLOWED_USER_EMAILS=`[]` # if it's defined, only these emails will be allowed to use the app
\ No newline at end of file
diff --git a/src/routes/login/callback/+page.server.ts b/src/routes/login/callback/+page.server.ts
index 01411fff6ea..020c077c253 100644
--- a/src/routes/login/callback/+page.server.ts
+++ b/src/routes/login/callback/+page.server.ts
@@ -3,6 +3,14 @@ import { getOIDCUserData, validateAndParseCsrfToken } from "$lib/server/auth";
 import { z } from "zod";
 import { base } from "$app/paths";
 import { updateUser } from "./updateUser";
+import { ALLOWED_USER_EMAILS } from "$env/static/private";
+import JSON5 from "json5";
+
+const allowedUserEmails = z
+	.array(z.string().email())
+	.optional()
+	.default([])
+	.parse(JSON5.parse(ALLOWED_USER_EMAILS));
 
 export async function load({ url, locals, cookies, request, getClientAddress }) {
 	const { error: errorName, error_description: errorDescription } = z
@@ -33,6 +41,20 @@ export async function load({ url, locals, cookies, request, getClientAddress })
 
 	const { userData } = await getOIDCUserData({ redirectURI: validatedToken.redirectUrl }, code);
 
+	// Filter by allowed user emails
+	if (allowedUserEmails.length > 0) {
+		if (!userData.email) {
+			throw error(403, "User not allowed: email not returned");
+		}
+		const emailVerified = userData.email_verified ?? true;
+		if (!emailVerified) {
+			throw error(403, "User not allowed: email not verified");
+		}
+		if (!allowedUserEmails.includes(userData.email)) {
+			throw error(403, "User not allowed");
+		}
+	}
+
 	await updateUser({
 		userData,
 		locals,