diff --git a/app/api/routers/calendar.py b/app/api/routers/calendar.py
index 3f0b0f1..b641c41 100644
--- a/app/api/routers/calendar.py
+++ b/app/api/routers/calendar.py
@@ -62,10 +62,52 @@ from app.services.slot_immutability import (
     guard_plan_cancel_no_past_retroaction,
     guard_plan_edit_no_past_retroaction,
 )
+from app.models.role_permission import Permission, RolePermission
 
 router = APIRouter(prefix="/calendar", tags=["Calendar"])
 
 
+def _has_global_permission(db: Session, user: User, permission_name: str) -> bool:
+    if user.is_admin:
+        return True
+    if not user.role_id:
+        return False
+    perm = db.query(Permission).filter(Permission.name == permission_name).first()
+    if not perm:
+        return False
+    return db.query(RolePermission).filter(
+        RolePermission.role_id == user.role_id,
+        RolePermission.permission_id == perm.id,
+    ).first() is not None
+
+
+def _require_calendar_permission(db: Session, user: User, permission_name: str) -> User:
+    if _has_global_permission(db, user, permission_name):
+        return user
+    raise HTTPException(status_code=403, detail=f"Calendar permission '{permission_name}' required")
+
+
+def require_calendar_read(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    return _require_calendar_permission(db, current_user, "calendar.read")
+
+
+def require_calendar_write(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    return _require_calendar_permission(db, current_user, "calendar.write")
+
+
+def require_calendar_manage(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    return _require_calendar_permission(db, current_user, "calendar.manage")
+
+
 # ---------------------------------------------------------------------------
 # TimeSlot creation (BE-CAL-API-001)
 # ---------------------------------------------------------------------------
@@ -101,7 +143,7 @@ def _slot_to_response(slot: TimeSlot) -> TimeSlotResponse:
 def create_slot(
     payload: TimeSlotCreate,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Create a one-off calendar slot.
 
@@ -230,7 +272,7 @@ def _virtual_slot_to_item(vs: dict) -> CalendarSlotItem:
 def get_calendar_day(
     date: Optional[date_type] = Query(None, description="Target date (defaults to today)"),
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_read),
 ):
     """Return all calendar slots for the authenticated user on the given date.
 
@@ -301,7 +343,7 @@ def edit_real_slot(
     slot_id: int,
     payload: TimeSlotEdit,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Edit an existing real (materialized) slot.
 
@@ -380,7 +422,7 @@ def edit_virtual_slot(
     virtual_id: str,
     payload: TimeSlotEdit,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Edit a virtual (plan-generated) slot.
 
@@ -469,7 +511,7 @@ def edit_virtual_slot(
 def cancel_real_slot(
     slot_id: int,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Cancel an existing real (materialized) slot.
 
@@ -516,7 +558,7 @@ def cancel_real_slot(
 def cancel_virtual_slot(
     virtual_id: str,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Cancel a virtual (plan-generated) slot.
 
@@ -596,7 +638,7 @@ def _plan_to_response(plan: SchedulePlan) -> SchedulePlanResponse:
 def create_plan(
     payload: SchedulePlanCreate,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Create a new recurring schedule plan.
 
@@ -632,7 +674,7 @@ def create_plan(
 def list_plans(
     include_inactive: bool = Query(False, description="Include cancelled/inactive plans"),
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_read),
 ):
     """Return all schedule plans for the authenticated user.
 
@@ -658,7 +700,7 @@ def list_plans(
 def get_plan(
     plan_id: int,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_read),
 ):
     """Return a single schedule plan owned by the authenticated user."""
     plan = (
@@ -705,7 +747,7 @@ def edit_plan(
     plan_id: int,
     payload: SchedulePlanEdit,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Edit an existing schedule plan.
 
@@ -792,7 +834,7 @@ def edit_plan(
 def cancel_plan(
     plan_id: int,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_write),
 ):
     """Cancel (soft-delete) a schedule plan.
 
@@ -859,7 +901,7 @@ _DATE_LIST_EXCLUDED_STATUSES = {SlotStatus.SKIPPED.value, SlotStatus.ABORTED.val
 )
 def list_dates(
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_read),
 ):
     """Return a sorted list of future dates that have at least one
     materialized (real) slot.
@@ -897,7 +939,7 @@ def list_dates(
 )
 def get_my_workload_config(
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_manage),
 ):
     """Return the workload thresholds for the authenticated user.
 
@@ -916,7 +958,7 @@ def get_my_workload_config(
 def put_my_workload_config(
     payload: MinimumWorkloadConfig,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_manage),
 ):
     """Full replacement of the workload configuration."""
     row = replace_workload_config(db, current_user.id, payload)
@@ -933,7 +975,7 @@ def put_my_workload_config(
 def patch_my_workload_config(
     payload: MinimumWorkloadUpdate,
     db: Session = Depends(get_db),
-    current_user: User = Depends(get_current_user),
+    current_user: User = Depends(require_calendar_manage),
 ):
     """Partial update — only the provided periods are overwritten."""
     row = upsert_workload_config(db, current_user.id, payload)