HMS Onslaught was an O-class destroyer of the Royal Navy which entered service in 1941.

On 19 June 1942 Onslaught was commissioned for service in the 17th Destroyer Flotilla, as part of the Home Fleet.

Onslaught remained in commission after VJ Day and in September 1945 was deployed for training duties at Portsmouth Gunnery School, HMS Excellent.

In December she was detached to take part in Operation Deadlight, the destruction of surrendered U-boats in the Northwestern Approaches.

[2] In 1957 the ship was converted at Liverpool to a Type 16 anti-submarine frigate and remained on the Active List until 1975.