diff --git a/bench_loop/dashboard/api/routes/benchmark.py b/bench_loop/dashboard/api/routes/benchmark.py
index 28385db..9690553 100644
--- a/bench_loop/dashboard/api/routes/benchmark.py
+++ b/bench_loop/dashboard/api/routes/benchmark.py
@@ -3,6 +3,7 @@
 
 import asyncio
 import json
+import shutil
 import time
 import uuid
 from datetime import datetime, timezone
@@ -386,3 +387,25 @@ async def get_run(run_id: str):
         "result": data,
         "hardware": hw_data,
     }
+
+
+@router.delete("/benchmark/runs/{run_id}")
+async def delete_run(run_id: str):
+    """Delete a persisted local benchmark run."""
+    state = _active_runs.get(run_id)
+    if state and state.get("status") not in ("completed", "failed", "cancelled"):
+        raise HTTPException(status_code=409, detail="Cannot delete an active run. Cancel it first.")
+
+    runs_root = RUNS_DIR.resolve()
+    run_dir = (RUNS_DIR / run_id).resolve()
+    if run_dir.parent != runs_root:
+        raise HTTPException(status_code=400, detail="Invalid run id")
+
+    if not run_dir.exists():
+        raise HTTPException(status_code=404, detail="Run not found")
+    if not run_dir.is_dir():
+        raise HTTPException(status_code=400, detail="Run path is not a directory")
+
+    shutil.rmtree(run_dir)
+    _active_runs.pop(run_id, None)
+    return {"ok": True, "run_id": run_id}
diff --git a/tests/test_dashboard_runs.py b/tests/test_dashboard_runs.py
new file mode 100644
index 0000000..b6020c7
--- /dev/null
+++ b/tests/test_dashboard_runs.py
@@ -0,0 +1,52 @@
+import asyncio
+
+import pytest
+from fastapi import HTTPException
+
+from bench_loop.dashboard.api.routes import benchmark
+
+
+def run(coro):
+    return asyncio.run(coro)
+
+
+def test_delete_run_removes_persisted_run_directory(tmp_path, monkeypatch):
+    monkeypatch.setattr(benchmark, "RUNS_DIR", tmp_path)
+    run_dir = tmp_path / "20260601-120000-model-local-ollama"
+    run_dir.mkdir()
+    (run_dir / "run.json").write_text("{}", encoding="utf-8")
+
+    result = run(benchmark.delete_run(run_dir.name))
+
+    assert result == {"ok": True, "run_id": run_dir.name}
+    assert not run_dir.exists()
+
+
+def test_delete_run_rejects_path_traversal(tmp_path, monkeypatch):
+    monkeypatch.setattr(benchmark, "RUNS_DIR", tmp_path)
+
+    with pytest.raises(HTTPException) as exc:
+        run(benchmark.delete_run("../outside"))
+
+    assert exc.value.status_code == 400
+
+
+def test_delete_run_rejects_active_run(tmp_path, monkeypatch):
+    monkeypatch.setattr(benchmark, "RUNS_DIR", tmp_path)
+    benchmark._active_runs["active123"] = {"status": "running"}
+
+    try:
+        with pytest.raises(HTTPException) as exc:
+            run(benchmark.delete_run("active123"))
+        assert exc.value.status_code == 409
+    finally:
+        benchmark._active_runs.pop("active123", None)
+
+
+def test_delete_run_returns_404_for_missing_run(tmp_path, monkeypatch):
+    monkeypatch.setattr(benchmark, "RUNS_DIR", tmp_path)
+
+    with pytest.raises(HTTPException) as exc:
+        run(benchmark.delete_run("missing"))
+
+    assert exc.value.status_code == 404