diff --git a/app/agenda/page.tsx b/app/agenda/page.tsx
index 2784c3e..91f8852 100644
--- a/app/agenda/page.tsx
+++ b/app/agenda/page.tsx
@@ -54,6 +54,11 @@ export default async function CalendarPage() {
         orderBy: {
           start: 'asc'
         }
+      },
+      mission: {
+        include: {
+          missionUsers: true
+        }
       }
     }
   });
diff --git a/app/api/events/[id]/route.ts b/app/api/events/[id]/route.ts
index d4a0239..33597ff 100644
--- a/app/api/events/[id]/route.ts
+++ b/app/api/events/[id]/route.ts
@@ -3,6 +3,39 @@ import { getServerSession } from "next-auth/next";
 import { authOptions } from "@/app/api/auth/options";
 import { prisma } from "@/lib/prisma";
 
+// Helper function to check if user can manage events in a mission calendar
+async function canManageMissionCalendar(userId: string, calendarId: string): Promise<boolean> {
+  const calendar = await prisma.calendar.findUnique({
+    where: { id: calendarId },
+    include: {
+      mission: {
+        include: {
+          missionUsers: true
+        }
+      }
+    }
+  });
+
+  // If calendar is not linked to a mission, allow (it's a regular calendar)
+  if (!calendar?.missionId || !calendar.mission) {
+    return true;
+  }
+
+  const mission = calendar.mission;
+
+  // Check if user is the creator of the mission
+  if (mission.creatorId === userId) {
+    return true;
+  }
+
+  // Check if user is a gardien-temps (time guardian) for this mission
+  const isGardienTemps = mission.missionUsers.some(
+    (mu) => mu.userId === userId && mu.role === 'gardien-temps'
+  );
+
+  return isGardienTemps;
+}
+
 export async function DELETE(req: NextRequest, props: { params: Promise<{ id: string }> }) {
   const params = await props.params;
   const session = await getServerSession(authOptions);
@@ -33,6 +66,17 @@ export async function DELETE(req: NextRequest, props: { params: Promise<{ id: st
       );
     }
 
+    // If calendar is linked to a mission, check permissions
+    if (event.calendar.missionId) {
+      const canManage = await canManageMissionCalendar(session.user.id, event.calendarId);
+      if (!canManage) {
+        return NextResponse.json(
+          { error: "Seul le créateur de la mission ou le gardien-temps peut supprimer des événements" },
+          { status: 403 }
+        );
+      }
+    }
+
     // Delete the event
     await prisma.event.delete({
       where: { id: params.id },
diff --git a/app/api/events/route.ts b/app/api/events/route.ts
index 318babd..212d4b5 100644
--- a/app/api/events/route.ts
+++ b/app/api/events/route.ts
@@ -3,6 +3,39 @@ import { getServerSession } from "next-auth/next";
 import { authOptions } from "@/app/api/auth/options";
 import { prisma } from "@/lib/prisma";
 
+// Helper function to check if user can manage events in a mission calendar
+async function canManageMissionCalendar(userId: string, calendarId: string): Promise<boolean> {
+  const calendar = await prisma.calendar.findUnique({
+    where: { id: calendarId },
+    include: {
+      mission: {
+        include: {
+          missionUsers: true
+        }
+      }
+    }
+  });
+
+  // If calendar is not linked to a mission, allow (it's a regular calendar)
+  if (!calendar?.missionId || !calendar.mission) {
+    return true;
+  }
+
+  const mission = calendar.mission;
+
+  // Check if user is the creator of the mission
+  if (mission.creatorId === userId) {
+    return true;
+  }
+
+  // Check if user is a gardien-temps (time guardian) for this mission
+  const isGardienTemps = mission.missionUsers.some(
+    (mu) => mu.userId === userId && mu.role === 'gardien-temps'
+  );
+
+  return isGardienTemps;
+}
+
 export async function POST(req: NextRequest) {
   const session = await getServerSession(authOptions);
 
@@ -36,6 +69,17 @@ export async function POST(req: NextRequest) {
       );
     }
 
+    // If calendar is linked to a mission, check permissions
+    if (calendar.missionId) {
+      const canManage = await canManageMissionCalendar(session.user.id, calendarId);
+      if (!canManage) {
+        return NextResponse.json(
+          { error: "Seul le créateur de la mission ou le gardien-temps peut créer des événements" },
+          { status: 403 }
+        );
+      }
+    }
+
     // Create event with all required fields
     const event = await prisma.event.create({
       data: {
@@ -114,6 +158,17 @@ export async function PUT(req: NextRequest) {
       );
     }
 
+    // If calendar is linked to a mission, check permissions
+    if (calendar.missionId) {
+      const canManage = await canManageMissionCalendar(session.user.id, calendarId);
+      if (!canManage) {
+        return NextResponse.json(
+          { error: "Seul le créateur de la mission ou le gardien-temps peut modifier des événements" },
+          { status: 403 }
+        );
+      }
+    }
+
     const event = await prisma.event.update({
       where: { id },
       data: {
diff --git a/app/api/missions/route.ts b/app/api/missions/route.ts
index a657ff1..d37996d 100644
--- a/app/api/missions/route.ts
+++ b/app/api/missions/route.ts
@@ -317,6 +317,7 @@ export async function POST(request: Request) {
             color: calendarColor,
             description: `Calendrier pour la mission "${mission.name}"`,
             userId: memberId,
+            missionId: mission.id, // Link calendar to mission
           },
         });
       });
diff --git a/components/calendar/calendar-client.tsx b/components/calendar/calendar-client.tsx
index 916707f..5faa345 100644
--- a/components/calendar/calendar-client.tsx
+++ b/components/calendar/calendar-client.tsx
@@ -62,8 +62,20 @@ const colorPalette = [
   "#2563eb", // Blue
 ];
 
+interface CalendarWithMission extends Calendar {
+  missionId?: string | null;
+  mission?: {
+    id: string;
+    creatorId: string;
+    missionUsers: Array<{
+      userId: string;
+      role: string;
+    }>;
+  } | null;
+}
+
 interface CalendarClientProps {
-  initialCalendars: (Calendar & { events: Event[] })[];
+  initialCalendars: (CalendarWithMission & { events: Event[] })[];
   userId: string;
   userProfile: {
     name: string;
@@ -949,25 +961,63 @@ export function CalendarClient({ initialCalendars, userId, userProfile }: Calend
                   </h2>
                 );
               })()}
-              <Button
-                onClick={() => {
-                  setSelectedEvent(null);
-                      setEventForm({
-                        title: "",
-                        description: null,
-                        start: new Date().toISOString(),
-                        end: new Date(new Date().setHours(new Date().getHours() + 1)).toISOString(),
-                        allDay: false,
-                        location: null,
-                        calendarId: selectedCalendarId
-                      });
-                      setIsEventModalOpen(true);
-                    }}
-                    className="bg-blue-600 hover:bg-blue-700 text-white"
-                  >
-                    <Plus className="mr-2 h-4 w-4" />
-                    <span className="font-medium">Nouvel événement</span>
-              </Button>
+              {(() => {
+                // Check if user can create events in the selected calendar(s)
+                const canCreateEvent = () => {
+                  // If multiple calendars are visible, allow creation
+                  if (visibleCalendarIds.length !== 1) {
+                    return true;
+                  }
+                  
+                  const selectedCal = calendars.find(cal => cal.id === visibleCalendarIds[0]);
+                  if (!selectedCal) return true;
+                  
+                  // If calendar is not linked to a mission, allow
+                  if (!selectedCal.missionId || !selectedCal.mission) {
+                    return true;
+                  }
+                  
+                  const mission = selectedCal.mission;
+                  
+                  // Check if user is the creator
+                  if (mission.creatorId === userId) {
+                    return true;
+                  }
+                  
+                  // Check if user is gardien-temps
+                  const isGardienTemps = mission.missionUsers.some(
+                    (mu) => mu.userId === userId && mu.role === 'gardien-temps'
+                  );
+                  
+                  return isGardienTemps;
+                };
+                
+                if (!canCreateEvent()) {
+                  return null;
+                }
+                
+                return (
+                  <Button
+                    onClick={() => {
+                      setSelectedEvent(null);
+                          setEventForm({
+                            title: "",
+                            description: null,
+                            start: new Date().toISOString(),
+                            end: new Date(new Date().setHours(new Date().getHours() + 1)).toISOString(),
+                            allDay: false,
+                            location: null,
+                            calendarId: selectedCalendarId
+                          });
+                          setIsEventModalOpen(true);
+                        }}
+                        className="bg-blue-600 hover:bg-blue-700 text-white"
+                      >
+                        <Plus className="mr-2 h-4 w-4" />
+                        <span className="font-medium">Nouvel événement</span>
+                  </Button>
+                );
+              })()}
             </div>
 
             <Tabs value={view} className="w-auto">
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 98294da..37cb70d 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -33,12 +33,15 @@ model Calendar {
   color       String   @default("#0082c9")
   description String?
   userId      String
+  missionId   String?  // Optional: link to mission if this is a mission calendar
   createdAt   DateTime @default(now())
   updatedAt   DateTime @updatedAt
   events      Event[]
   user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  mission     Mission?  @relation(fields: [missionId], references: [id], onDelete: Cascade)
 
   @@index([userId])
+  @@index([missionId])
 }
 
 model Event {
@@ -142,6 +145,7 @@ model Mission {
   creatorId         String
   attachments       Attachment[]
   missionUsers      MissionUser[]
+  calendars         Calendar[]     // Calendars linked to this mission
 
   // External integration fields
   leantimeProjectId     String?