diff --git a/app/agenda/page.tsx b/app/agenda/page.tsx
index 37ce451..e8793fb 100644
--- a/app/agenda/page.tsx
+++ b/app/agenda/page.tsx
@@ -44,7 +44,7 @@ export default async function CalendarPage() {
 
   const userId = session.user.username || session.user.email || '';
   
-  // Get all calendars for the user with mission relation
+  // Get all calendars for the user with mission relation and sync configuration
   let calendars = await prisma.calendar.findMany({
     where: {
       userId: session?.user?.id || '',
@@ -59,6 +59,17 @@ export default async function CalendarPage() {
         include: {
           missionUsers: true
         }
+      },
+      syncConfig: {
+        include: {
+          mailCredential: {
+            select: {
+              id: true,
+              email: true,
+              display_name: true,
+            }
+          }
+        }
       }
     }
   });
diff --git a/components/calendar/calendar-client.tsx b/components/calendar/calendar-client.tsx
index 5faa345..e4180c1 100644
--- a/components/calendar/calendar-client.tsx
+++ b/components/calendar/calendar-client.tsx
@@ -72,6 +72,21 @@ interface CalendarWithMission extends Calendar {
       role: string;
     }>;
   } | null;
+  syncConfig?: {
+    id: string;
+    provider: string;
+    externalCalendarId: string | null;
+    externalCalendarUrl: string | null;
+    syncEnabled: boolean;
+    lastSyncAt: Date | null;
+    syncFrequency: number;
+    lastSyncError: string | null;
+    mailCredential?: {
+      id: string;
+      email: string;
+      display_name: string | null;
+    } | null;
+  } | null;
 }
 
 interface CalendarClientProps {
@@ -827,6 +842,23 @@ export function CalendarClient({ initialCalendars, userId, userProfile }: Calend
     }
   };
 
+  const getCalendarDisplayName = (calendar: CalendarWithMission) => {
+    // If calendar is synced to an external account, show the account label
+    if (calendar.syncConfig && calendar.syncConfig.mailCredential) {
+      const accountLabel =
+        calendar.syncConfig.mailCredential.display_name ||
+        calendar.syncConfig.mailCredential.email;
+      return accountLabel || (calendar.name === "Default" ? "Privée" : calendar.name);
+    }
+
+    // Legacy default name
+    if (calendar.name === "Default") {
+      return "Privée";
+    }
+
+    return calendar.name;
+  };
+
   // Update CalendarSelector to handle visibility - displayed as a left column
   const CalendarSelector = () => (
     <div className="flex flex-col gap-2 mb-4">
@@ -847,7 +879,14 @@ export function CalendarClient({ initialCalendars, userId, userProfile }: Calend
               className="w-3 h-3 rounded-full" 
               style={{ backgroundColor: calendar.color }}
             />
-            <span>{calendar.name === "Default" ? "Privée" : calendar.name}</span>
+            <span className="flex items-center gap-1">
+              {getCalendarDisplayName(calendar as CalendarWithMission)}
+              {calendar.syncConfig?.syncEnabled && (
+                <Badge variant="outline" className="text-[10px] px-1 py-0.5 border-blue-400 text-blue-600">
+                  Sync
+                </Badge>
+              )}
+            </span>
             <div className="ml-auto">
               {visibleCalendarIds.includes(calendar.id) ? (
                 <Check className="h-4 w-4" />
@@ -951,14 +990,23 @@ export function CalendarClient({ initialCalendars, userId, userProfile }: Calend
             <div className="flex items-center gap-4">
               {/* Display selected calendar name */}
               {(() => {
-                const selectedCal = calendars.find(cal => visibleCalendarIds.includes(cal.id) && visibleCalendarIds.length === 1);
-                const displayName = selectedCal 
-                  ? (selectedCal.name === "Default" ? "Privée" : selectedCal.name)
+                const selectedCal = calendars.find(
+                  cal => visibleCalendarIds.includes(cal.id) && visibleCalendarIds.length === 1
+                ) as CalendarWithMission | undefined;
+                const displayName = selectedCal
+                  ? getCalendarDisplayName(selectedCal)
                   : "Tous les calendriers";
                 return (
-                  <h2 className="text-lg font-semibold text-gray-900">
-                    {displayName}
-                  </h2>
+                  <div className="flex items-center gap-2">
+                    <h2 className="text-lg font-semibold text-gray-900">
+                      {displayName}
+                    </h2>
+                    {selectedCal?.syncConfig?.syncEnabled && (
+                      <Badge variant="outline" className="text-[10px] px-1.5 py-0.5 border-blue-400 text-blue-600">
+                        Synchronisé
+                      </Badge>
+                    )}
+                  </div>
                 );
               })()}
               {(() => {
@@ -1275,7 +1323,10 @@ export function CalendarClient({ initialCalendars, userId, userProfile }: Calend
             <div className="space-y-2">
               <Label className="text-base font-semibold text-gray-800">Calendrier</Label>
               <div className="grid grid-cols-2 gap-2">
-                {calendars.map((cal) => (
+                {calendars.map((cal) => {
+                  const calWithMission = cal as CalendarWithMission;
+                  const label = getCalendarDisplayName(calWithMission);
+                  return (
                   <button
                     key={cal.id}
                     type="button"
@@ -1300,10 +1351,15 @@ export function CalendarClient({ initialCalendars, userId, userProfile }: Calend
                         ? 'font-medium text-gray-900' 
                         : 'text-gray-700'
                     }`}>
-                      {cal.name}
+                      {label}
                     </span>
+                    {calWithMission.syncConfig?.syncEnabled && (
+                      <Badge variant="outline" className="ml-auto text-[10px] px-1 py-0.5 border-blue-400 text-blue-600">
+                        Sync
+                      </Badge>
+                    )}
                   </button>
-                ))}
+                );})}
               </div>
             </div>