HMS Largo Bay (K423) was a Bay-class anti-aircraft frigate of the British Royal Navy, named for Largo Bay in Fife. The ship was originally ordered from William Pickersgill & Sons Ltd. of Southwick, Sunderland on 25 January 1943 as the Loch Foin, and laid down on 8 February 1944. However the contract was then changed, and the ship was completed to a revised design as a Bay-class anti-aircraft frigate, launched on 3 October 1944, and commissioned on 26 January 1946.