HMS Montclare (F85) was a British ocean liner that was commissioned into the Royal Navy as an armed merchant cruiser in 1939, converted into a destroyer depot ship in 1944 and a submarine depot ship in 1946. She was decommissioned in 1954 and scrapped in 1958. Montclare was launched in Scotland in 1921 as a transatlantic liner for the Canadian Pacific Steamship Company. She was one of three sister ships. The others were Montrose, launched in 1920 and Montcalm, launched in 1921.