HMS Anchorite (P422/S22), was an Amphion-class submarine of the Royal Navy, built by Vickers-Armstrongs and launched 22 January 1946.
Anchorite had a displacement of when at the surface and while submerged. She had a total length of , a beam of , and a draught of . The submarine was powered by two Admiralty ML eight-cylinder diesel engines generating a power of each. She also contained four electric motors each producing that drove two shafts. She could carry a maximum of of diesel, although she usually carried between .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate at for or at for . When surfaced, she was able to travel at or at . She was fitted with ten torpedo tubes, one QF 4 inch naval gun Mk XXIII, one Oerlikon 20 mm cannon, and a .303 British Vickers machine gun. Her torpedo tubes were fitted to the bow and stern, and she could carry twenty torpedoes. Her complement was sixty-one crew members.
Anchorite was laid down at Vickers-Armstrongs' Barrow-in-Furness shipyard on 19 July 1945, was launched on 22 January 1946 and completed on 18 November 1947.
During build and before launch the names of Anchorite and HMS Amphion were switched. In 1953 she took part in the Fleet Review to celebrate the Coronation of Queen Elizabeth II.
Anchorite ran aground in Rothesay Bay, Firth of Forth, on 12 October 1956. On 3 October 1960, Anchorite, which was a member of the 4th Submarine Squadron based at Sydney, hit an uncharted rock in the Hauraki Gulf off Auckland, New Zealand at a depth of . No-one was injured in the incident. The submarine's commanding officer, Lieutenant Commander W. L. Owen, was cleared of any blame for the incident to the resulting court martial. The rock is now known as Anchorite Rock on the nautical charts of the area at depth, 16 m, .