The RMS Queen Mary is a retired British ocean liner that sailed primarily on the North Atlantic Ocean from 1936 to 1967 for the Cunard-White Star Line and built by John Brown & Company in Clydebank, Scotland.

Queen Mary was officially retired from service in 1967. She left Southampton for the last time on 31 October 1967 and sailed to the port of Long Beach, California, United States, where she remains permanently moored. The ship is listed on the National Register of Historic Places. The National Trust for Historic Preservation has accepted Queen Mary as part of the Historic Hotels of America.