HMS Anchusa (later renamed Silverlord and Sir Edgar) was a Flower-class corvette that served in the Royal Navy.

She was launched in 1941 under the crash wartime construction program instituted by the Royal Navy shortly before the Fall of France.

Built by Harland and Wolff in Belfast (one of only 34 Flower-class ships to be built in Northern Ireland), she incorporated a number of improvements to earlier Flower-class ships, that improved her performance in escorting convoys.

She had a relatively small crew of 96, with a displacement of nearly 1,000 tons, but she was mounted with the Hedgehog anti-submarine mortar, which launched contact-detonating depth charges at an enemy submarine far away from the boat itself.

She was instrumental in damaging German U-boat activities in the channel area and the Atlantic, and was used as a mercantile ship after the war, being renamed Silverlord in 1949.