diff --git a/frontend/src/views/CalendarView.vue b/frontend/src/views/CalendarView.vue
index 6c62dbd..e976850 100644
--- a/frontend/src/views/CalendarView.vue
+++ b/frontend/src/views/CalendarView.vue
@@ -119,7 +119,7 @@
     <Dialog v-model:visible="showCalImportDialog" header="In welchen Kalender importieren?" modal :style="{ width: '420px' }">
       <div class="field">
         <label>Kalender</label>
-        <Select v-model="importTargetCalId" :options="writableCalendars" optionLabel="name" optionValue="id" fluid />
+        <Select v-model="importTargetCalId" :options="writableCalendarOptions" optionLabel="label" optionValue="id" fluid />
       </div>
       <p class="hint" style="font-size:0.85rem;color:var(--p-text-muted-color)">Datei: {{ pendingImportFile?.name }}</p>
       <template #footer>
@@ -171,7 +171,7 @@
       </div>
       <div v-if="writableCalendars.length > 1" class="field">
         <label>Kalender</label>
-        <Select v-model="eventForm.calendar_id" :options="writableCalendars" optionLabel="name" optionValue="id" fluid />
+        <Select v-model="eventForm.calendar_id" :options="writableCalendarOptions" optionLabel="label" optionValue="id" fluid />
       </div>
       <div class="field-row">
         <div class="field">
@@ -636,6 +636,13 @@ const ownCalendars = computed(() => calendars.value.filter(c => c.permission ===
 const writableCalendars = computed(() =>
   calendars.value.filter(c => c.permission === 'owner' || c.permission === 'readwrite')
 )
+// Mit "(geteilt von <Name>)"-Suffix fuer eindeutige Anzeige in Selects.
+const writableCalendarOptions = computed(() => writableCalendars.value.map(c => ({
+  ...c,
+  label: c.permission === 'owner'
+    ? c.name
+    : `${c.name} (geteilt von ${c.owner_display_name || c.owner_name})`,
+})))
 const exportableCalendars = computed(() => calendars.value)
 
 // --- Calendar Import / Export ---
diff --git a/frontend/src/views/ContactsView.vue b/frontend/src/views/ContactsView.vue
index 694e085..26e83cc 100644
--- a/frontend/src/views/ContactsView.vue
+++ b/frontend/src/views/ContactsView.vue
@@ -197,8 +197,8 @@
           <TabPanel value="general">
             <div v-if="writableBooks.length > 1" class="field" style="max-width:400px">
               <label>Adressbuch</label>
-              <Select v-model="contactTargetBookId" :options="writableBooks"
-                      optionLabel="name" optionValue="id" fluid />
+              <Select v-model="contactTargetBookId" :options="writableBookOptions"
+                      optionLabel="label" optionValue="id" fluid />
             </div>
             <div class="photo-row">
               <div class="avatar large" :style="{ background: avatarColor(contactForm) }">
@@ -416,6 +416,12 @@ const contactTargetBookId = ref(null)
 const writableBooks = computed(() =>
   addressBooks.value.filter(b => b.permission === 'owner' || b.permission === 'readwrite')
 )
+const writableBookOptions = computed(() => writableBooks.value.map(b => ({
+  ...b,
+  label: b.permission === 'owner'
+    ? b.name
+    : `${b.name} (geteilt von ${b.owner_display_name || b.owner_name})`,
+})))
 const loading = ref(false)
 const searchQuery = ref('')
 let searchTimer = null
diff --git a/frontend/src/views/TasksView.vue b/frontend/src/views/TasksView.vue
index e87e609..2872e0c 100644
--- a/frontend/src/views/TasksView.vue
+++ b/frontend/src/views/TasksView.vue
@@ -183,8 +183,8 @@
             modal :style="{ width: '560px' }">
       <div v-if="writableLists.length > 1" class="field">
         <label>Liste</label>
-        <Select v-model="taskTargetListId" :options="writableLists"
-                optionLabel="name" optionValue="id" fluid />
+        <Select v-model="taskTargetListId" :options="writableListOptions"
+                optionLabel="label" optionValue="id" fluid />
       </div>
       <div class="field">
         <label>Titel</label>
@@ -271,6 +271,12 @@ const taskTargetListId = ref(null)
 const writableLists = computed(() =>
   lists.value.filter(l => l.permission === 'owner' || l.permission === 'readwrite')
 )
+const writableListOptions = computed(() => writableLists.value.map(l => ({
+  ...l,
+  label: l.permission === 'owner'
+    ? l.name
+    : `${l.name} (geteilt von ${l.owner_display_name || l.owner_name})`,
+})))
 const tasks = ref([])
 const search = ref('')
 const hideDone = ref(false)