diff --git a/apps/web/src/app/(portal)/admin/ldap/page.tsx b/apps/web/src/app/(portal)/admin/ldap/page.tsx
index 261f3bd..9205a71 100644
--- a/apps/web/src/app/(portal)/admin/ldap/page.tsx
+++ b/apps/web/src/app/(portal)/admin/ldap/page.tsx
@@ -81,6 +81,15 @@ export default function AdminLdapPage() {
   const [discovering, setDiscovering] = useState(false);
   const [manualDn, setManualDn] = useState('');
   const [savingFilter, setSavingFilter] = useState(false);
+  const [discoverSearch, setDiscoverSearch] = useState('');
+
+  const filteredDiscovered = discovered?.filter((entry) => {
+    const q = discoverSearch.trim().toLowerCase();
+    if (!q) return true;
+    return (
+      entry.name.toLowerCase().includes(q) || entry.dn.toLowerCase().includes(q)
+    );
+  });
 
   const hasAccess =
     currentUser?.role === 'ADMIN' || currentUser?.role === 'SUPER_ADMIN';
@@ -555,26 +564,41 @@ export default function AdminLdapPage() {
           </div>
 
           {discovered && discovered.length > 0 && (
-            <div className="mb-4 max-h-64 overflow-y-auto rounded-md border border-border divide-y divide-border">
-              {discovered.map((entry) => (
-                <label
-                  key={entry.dn}
-                  className="flex items-center gap-3 px-4 py-2 text-sm hover:bg-muted/30 cursor-pointer"
-                >
-                  <input
-                    type="checkbox"
-                    checked={groupFilterDns.includes(entry.dn)}
-                    onChange={() => toggleGroupFilterDn(entry.dn)}
-                  />
-                  <span className="rounded bg-muted px-1.5 py-0.5 text-xs font-medium text-muted-foreground">
-                    {entry.type === 'ou' ? t('groupFilter.typeOu') : t('groupFilter.typeGroup')}
-                  </span>
-                  <span className="font-medium text-foreground">{entry.name}</span>
-                  <span className="font-mono text-xs text-muted-foreground truncate">
-                    {entry.dn}
-                  </span>
-                </label>
-              ))}
+            <div className="mb-4 space-y-2">
+              <input
+                type="text"
+                value={discoverSearch}
+                onChange={(e) => setDiscoverSearch(e.target.value)}
+                placeholder={t('groupFilter.searchPlaceholder')}
+                className="flex h-9 w-full rounded-md border border-input bg-background px-3 py-1 text-sm"
+              />
+              <div className="max-h-64 overflow-y-auto rounded-md border border-border divide-y divide-border">
+                {filteredDiscovered && filteredDiscovered.length > 0 ? (
+                  filteredDiscovered.map((entry) => (
+                    <label
+                      key={entry.dn}
+                      className="flex items-center gap-3 px-4 py-2 text-sm hover:bg-muted/30 cursor-pointer"
+                    >
+                      <input
+                        type="checkbox"
+                        checked={groupFilterDns.includes(entry.dn)}
+                        onChange={() => toggleGroupFilterDn(entry.dn)}
+                      />
+                      <span className="rounded bg-muted px-1.5 py-0.5 text-xs font-medium text-muted-foreground">
+                        {entry.type === 'ou' ? t('groupFilter.typeOu') : t('groupFilter.typeGroup')}
+                      </span>
+                      <span className="font-medium text-foreground">{entry.name}</span>
+                      <span className="font-mono text-xs text-muted-foreground truncate">
+                        {entry.dn}
+                      </span>
+                    </label>
+                  ))
+                ) : (
+                  <p className="px-4 py-3 text-sm text-muted-foreground">
+                    {t('groupFilter.noMatches')}
+                  </p>
+                )}
+              </div>
             </div>
           )}
 
diff --git a/apps/web/src/messages/de.json b/apps/web/src/messages/de.json
index 2cef254..f64ead1 100644
--- a/apps/web/src/messages/de.json
+++ b/apps/web/src/messages/de.json
@@ -318,6 +318,8 @@
         "typeOu": "OU",
         "typeGroup": "Gruppe",
         "noneFound": "Keine Gruppen oder OUs gefunden.",
+        "searchPlaceholder": "Gruppen/OUs durchsuchen...",
+        "noMatches": "Keine Treffer fuer diese Suche.",
         "manualDn": "DN manuell hinzufuegen",
         "addDn": "Hinzufuegen",
         "selected": "Ausgewaehlt",
diff --git a/apps/web/src/messages/en.json b/apps/web/src/messages/en.json
index 18e03ff..4b62c4f 100644
--- a/apps/web/src/messages/en.json
+++ b/apps/web/src/messages/en.json
@@ -318,6 +318,8 @@
         "typeOu": "OU",
         "typeGroup": "Group",
         "noneFound": "No groups or OUs found.",
+        "searchPlaceholder": "Search groups/OUs...",
+        "noMatches": "No matches for this search.",
         "manualDn": "Add DN manually",
         "addDn": "Add",
         "selected": "Selected",