RMS Ausonia, launched in 1921, was one of Cunard's six post-World War I "A-class" ocean liners for the Canadian service.

On 29 April 1939, English composer Benjamin Britten and tenor Peter Pears sailed from Southampton for Canada on Ausonia to begin what became a three-year sojourn in North America.

[1] On 2 September 1939, with British involvement in the Second World War imminent, Ausonia was hurriedly docked at Quebec and repainted grey.

[2] With the outbreak of war, Ausonia was requisitioned by the Admiralty and converted into an armed merchant cruiser, commissioning on 7 November that year with a pennant number of F53.

In September 1965, having been sold for scrap, she left Portsmouth to be broken up at Castellón de la Plana, Spain.