HMCS Lanark was a River-class frigate that served with the Royal Canadian Navy during the Second World War and again from 1956–1965 as a Prestonian-class frigate. She fought primarily in the Battle of the Atlantic as a convoy escort. She was named for Lanark, Ontario. Lanark was ordered in June 1942 as part of the 1942–1943 River-class building program. She was laid down on 25 September 1943 by Canadian Vickers Ltd. at Montreal, Quebec and launched 10 December 1943. She was commissioned into the RCN on 6 July 1944 at Montreal.