HMS Carnarvon Bay (K630) was a Bay-class anti-aircraft frigate of the British Royal Navy. She is named after Caernarfon Bay (at one time anglicised as 'Carnarvon Bay') in Gwynedd, Wales. She was originally ordered as the Loch-class vessel Loch Maddy, but the order was changed in 1944. Built by Henry Robb of Leith, the ship was laid down on 8 June 1944 and launched on 15 March 1945 by Lady Westwood.