HMS Londonderry was a Rothesay- or Type 12-class anti-submarine frigate of the British Royal Navy in service from 1960 to 1984.

The Rothesay-class was an improved version of the Whitby-class anti-submarine frigate, with nine Rothesays ordered in the 1954–55 shipbuilding programme for the Royal Navy to supplement the six Whitbys.

Seacat was not yet ready, and Londonderry was completed with a single Bofors 40 mm Automatic Gun L/60 mount aft as a temporary anti-aircraft armament.

She then carried out time in the Home Fleet before departing Portsmouth, Hampshire, UK, on 1 May 1961 for her first cruise in the Caribbean area.

[18] In October 1961 she was diverted to assist the Italian liner MV Bianca C. when the latter caught fire in the port of St. George's, Grenada.

[23] In November 1975 she entered the Rosyth Dockyard to be refitted as a trials ship for Admiralty Surface Weapons Establishment.

Additional navigational equipment and accommodation were installed to provide berths for both midshipmen from Dartmouth and apprentices from HMS Caledonia who were undergoing sea training.

Originally she should have been put on the disposal list, but due to the Falklands War she became the Dartmouth Training Ship of the 6th Frigate Squadron.

From 20 January to 29 March Londonderry made her last cruise from Portsmouth for the Dartmouth Training Squadron's deployment to the West Indies and USA.