The following ships are named Queen Mary:
HMS Queen Mary, a battlecruiser of the Royal Navy launched in 1912 and sunk at the Battle of Jutland in 1916
TS Queen Mary, a Clyde Steamer launched in 1933, now retired and stored in Tilbury Docks, London, UK
RMS Queen Mary, a Cunard Line ocean liner launched in 1934, now retired as a hotel in Long Beach, California, USA
RMS Queen Mary 2, a Cunard ocean liner that entered service in 2003