diff --git a/backend/app/routers/campaigns.py b/backend/app/routers/campaigns.py
index 312b9a4..af78199 100644
--- a/backend/app/routers/campaigns.py
+++ b/backend/app/routers/campaigns.py
@@ -298,6 +298,29 @@ def activate_campaign(
         uow.commit()
     db.refresh(campaign)
 
+    # Create Jira test tickets for any campaign tests that don't have one yet,
+    # nested under the campaign's Jira ticket (non-fatal).
+    try:
+        from app.services.jira_service import (
+            auto_create_test_issue,
+            get_campaign_jira_key,
+            get_test_jira_key,
+        )
+        campaign_jira_key = get_campaign_jira_key(db, campaign_id)
+        if campaign_jira_key:
+            for ct in campaign.campaign_tests:
+                if ct.test and not get_test_jira_key(db, ct.test.id):
+                    auto_create_test_issue(
+                        db, ct.test, current_user,
+                        parent_ticket_override=campaign_jira_key,
+                    )
+            db.commit()
+    except Exception:
+        logger.exception(
+            "Jira test ticket creation failed during activation of campaign %s",
+            campaign_id,
+        )
+
     return serialize_campaign(db, campaign)