The second HMS Mounsey (K569) was a British Captain-class frigate of the Royal Navy in commission during World War II.

The ship was commissioned into service in the Royal Navy as HMS Mounsey (K569) on 24 December 1943,[2] the day after her transfer.

She served on escort duty, protecting convoys in the North Atlantic Ocean as well as Arctic convoys carrying equipment and supplies to the Soviet Union.

On 2 November 1944, Mounsey was escorting Convoy RA 61 in the Barents Sea outbound from the Soviet Union when the German submarine U-295 damaged her with a G7es – known to the Allies as "GNAT" – acoustic torpedo, forcing her to return to the Kola Inlet for temporary repairs.

At 2300 hours on 10 May 1945, just after the end of World War II, Mounsey accepted the surrender of the German submarine U-1023, which held the distinction of being the last German submarine to sink an Allied warship during the war, off Land's End.