After the First World War, "Canterbury" served in the Black Sea in 1919 during the British intervention in the Russian Civil War. She commissioned at Portsmouth in November 1919 for service in the 1st Light Cruiser Squadron in the Atlantic Fleet. She was attached to the Gunnery School at Portsmouth from 1920 to 1922, then in the Portsmouth Reserve from 1922 to 1924. Following a refit, her 3 funnels were reduced to two. She was recommissioned again at Portsmouth in May 1924 to serve in the 2nd Cruiser Squadron in the Atlantic Fleet, before beginning another refit in June 1925.