HMS Gardiner (K478) was a British Captain-class frigate of the Royal Navy in commission during World War II.

O'Toole was transferred to the United Kingdom under Lend-Lease upon completion on 28 September 1943.

Commissioned into service in the Royal Navy as HMS Gardiner (K478) on 28 September 1943[1] simultaneously with her transfer, the ship served on patrol and escort duty for the remainder of World War II.

The United States sold Gardiner to the Atlas Steel and Supply Company on 10 December 1946 for scrapping.

In 1947, she was resold to the Kulky Steel and Equipment Company of Alliance, Ohio, and finally was scrapped in June 1947.