RFA Retainer (A329) was an armament support ship of the Royal Fleet Auxiliary.

Built by Scotts of Greenock as Chungking, a cargo/passenger liner for the China Navigation Co.

Both Chungking and her sister vessel Changchow (later RFA Resurgent lost their initial purpose due to the Communist revolution.

Chartered for a year and a half to the French Messageries Maritimes, they were purchased by the British Admiralty in 1952.

This article about a specific naval auxiliary ship or boat of the United Kingdom is a stub.