HMS Erne (U-18) is a Black Swan-class frigate laid down by Furness Shipbuilding at Barrow-in-Furness on May 26, 1938, launched on April 18, 1939 and commissioned on November 3, 1939.

The HMS Erne was reduced to a drill ship on June 4, 1952 and renamed Wessex. She arrived at Antwerp on October 27, 1965 where she was broken up.