diff --git a/app/routers/workers.py b/app/routers/workers.py
index 43efa07..8d7b8ec 100644
--- a/app/routers/workers.py
+++ b/app/routers/workers.py
@@ -98,3 +98,28 @@ async def list_workers(
         ))
 
     return WorkerListResponse(workers=worker_list)
+
+
+@workers_list_router.delete("/{worker_id}", status_code=204)
+async def delete_worker(
+    worker_id: str,
+    user: AuthenticatedUser = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """Delete a registered worker. Only the owning user can delete their workers."""
+    from sqlalchemy import delete as sa_delete
+
+    result = await db.execute(
+        sa_delete(Worker).where(
+            Worker.user_id == user.id,
+            Worker.worker_id == worker_id,
+        ).returning(Worker.id)
+    )
+    deleted = result.fetchone()
+    if not deleted:
+        from fastapi import HTTPException
+        raise HTTPException(
+            status_code=404,
+            detail={"error": {"code": "worker_not_found", "message": "Worker not found", "status": 404}},
+        )
+    await db.commit()
diff --git a/tests/test_worker_delete.py b/tests/test_worker_delete.py
new file mode 100644
index 0000000..83683c0
--- /dev/null
+++ b/tests/test_worker_delete.py
@@ -0,0 +1,69 @@
+"""Tests for DELETE /v1/workers/{worker_id}."""
+
+from __future__ import annotations
+
+import uuid
+
+import pytest
+import pytest_asyncio
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.user import User
+from app.models.worker import Worker
+
+
+async def _get_user_id(session: AsyncSession, user: dict) -> str:
+    result = await session.execute(select(User.id).where(User.email == user["email"]))
+    return str(result.scalar_one())
+
+
+async def _register_worker(session, user_id, worker_id="test-worker-1"):
+    from datetime import datetime, timezone
+    w = Worker(
+        user_id=user_id,
+        worker_id=worker_id,
+        last_heartbeat=datetime.now(timezone.utc),
+    )
+    session.add(w)
+    await session.commit()
+    return w
+
+
+@pytest.mark.asyncio
+async def test_delete_own_worker(client, auth_headers, db_session, registered_user):
+    """Delete own worker returns 204."""
+    user_id = await _get_user_id(db_session, registered_user)
+    worker_id = f"del-test-{uuid.uuid4().hex[:6]}"
+    await _register_worker(db_session, user_id, worker_id)
+
+    resp = await client.delete(f"/v1/workers/{worker_id}", headers=auth_headers)
+    assert resp.status_code == 204
+
+
+@pytest.mark.asyncio
+async def test_delete_nonexistent_worker(client, auth_headers):
+    """Delete non-existent worker returns 404."""
+    resp = await client.delete("/v1/workers/nonexistent-worker-xyz", headers=auth_headers)
+    assert resp.status_code == 404
+    assert resp.json()["error"]["code"] == "worker_not_found"
+
+
+@pytest.mark.asyncio
+async def test_delete_other_users_worker(client, auth_headers, db_session):
+    """Delete another user's worker returns 404 (no existence leak)."""
+    # Create a worker under a different user
+    other_user_id = str(uuid.uuid4())
+    worker_id = f"other-{uuid.uuid4().hex[:6]}"
+    from datetime import datetime, timezone
+    w = Worker(
+        user_id=other_user_id,
+        worker_id=worker_id,
+        last_heartbeat=datetime.now(timezone.utc),
+    )
+    db_session.add(w)
+    await db_session.commit()
+
+    # Try to delete as the authenticated user
+    resp = await client.delete(f"/v1/workers/{worker_id}", headers=auth_headers)
+    assert resp.status_code == 404