diff --git a/backend/app/routers/tests.py b/backend/app/routers/tests.py
index dce26df..21d5b4a 100644
--- a/backend/app/routers/tests.py
+++ b/backend/app/routers/tests.py
@@ -90,6 +90,9 @@ def list_tests(
     pending_validation_side: Optional[str] = Query(
         None, description="Filter in_review tests pending validation on 'red' or 'blue' side"
     ),
+    not_in_any_campaign: bool = Query(
+        False, description="Only return tests not linked to any campaign"
+    ),
     offset: int = Query(0, ge=0),
     limit: int = Query(50, ge=1, le=200),
     db: Session = Depends(get_db),
@@ -103,6 +106,7 @@ def list_tests(
         platform=platform,
         created_by=created_by,
         pending_validation_side=pending_validation_side,
+        not_in_any_campaign=not_in_any_campaign,
         offset=offset,
         limit=limit,
     )
diff --git a/backend/app/services/test_crud_service.py b/backend/app/services/test_crud_service.py
index 5c41f84..6864f71 100644
--- a/backend/app/services/test_crud_service.py
+++ b/backend/app/services/test_crud_service.py
@@ -19,6 +19,7 @@ from app.models.enums import TestState
 from app.models.technique import Technique
 from app.models.test import Test
 from app.models.test_template import TestTemplate
+from app.models.campaign import CampaignTest
 from app.models.audit import AuditLog
 from app.utils import escape_like
 
@@ -31,6 +32,7 @@ def list_tests(
     platform: str | None = None,
     created_by: uuid.UUID | None = None,
     pending_validation_side: str | None = None,
+    not_in_any_campaign: bool = False,
     offset: int = 0,
     limit: int = 50,
 ) -> list[Test]:
@@ -55,6 +57,9 @@ def list_tests(
             Test.state == TestState.in_review,
             Test.blue_validation_status.in_(["pending", None]),
         )
+    if not_in_any_campaign:
+        linked = db.query(CampaignTest.test_id).distinct().subquery()
+        query = query.filter(~Test.id.in_(linked))
 
     return query.order_by(Test.created_at.desc()).offset(offset).limit(limit).all()
 
diff --git a/frontend/src/api/tests.ts b/frontend/src/api/tests.ts
index 069ad6d..0780e9d 100644
--- a/frontend/src/api/tests.ts
+++ b/frontend/src/api/tests.ts
@@ -62,6 +62,7 @@ export interface TestListFilters {
   platform?: string;
   created_by?: string;
   pending_validation_side?: "red" | "blue";
+  not_in_any_campaign?: boolean;
   offset?: number;
   limit?: number;
 }
@@ -76,6 +77,7 @@ export async function getTests(filters?: TestListFilters): Promise<Test[]> {
   if (filters?.platform) params.append("platform", filters.platform);
   if (filters?.created_by) params.append("created_by", filters.created_by);
   if (filters?.pending_validation_side) params.append("pending_validation_side", filters.pending_validation_side);
+  if (filters?.not_in_any_campaign) params.append("not_in_any_campaign", "true");
   if (filters?.offset !== undefined) params.append("offset", String(filters.offset));
   if (filters?.limit !== undefined) params.append("limit", String(filters.limit));
 
diff --git a/frontend/src/components/AddTestToCampaignModal.tsx b/frontend/src/components/AddTestToCampaignModal.tsx
index c0a7391..bc65309 100644
--- a/frontend/src/components/AddTestToCampaignModal.tsx
+++ b/frontend/src/components/AddTestToCampaignModal.tsx
@@ -106,7 +106,7 @@ export default function AddTestToCampaignModal({
 
   const { data: allTests, isLoading: testsLoading } = useQuery({
     queryKey: ["tests", "for-campaign-picker"],
-    queryFn: () => getTests({ limit: 200 }),
+    queryFn: () => getTests({ state: "draft", not_in_any_campaign: true, limit: 200 }),
     enabled: open && tab === "existing",
   });
 
@@ -506,7 +506,7 @@ export default function AddTestToCampaignModal({
                     <p className="text-sm">
                       {existingSearch
                         ? "No tests match your search."
-                        : "No available tests to add."}
+                        : "No draft tests available. All existing tests are already in a campaign."}
                     </p>
                   </div>
                 ) : (