RMS Olympic was a British ocean liner and the lead ship of the White Star Line's trio of Olympic-class liners. Olympic had a career spanning 24 years from 1911 to 1935, in contrast to her short-lived sister ships, Titanic and Britannic. This included service as a troopship during the First World War, which gained her the nickname "Old Reliable", and during which she rammed and sank the U-boat U-103. She returned to civilian service after the war, and served successfully as an ocean liner throughout the 1920s and into the first half of the 1930s, although increased competition, and the slump in trade during the Great Depression after 1930, made her operation increasingly unprofitable. Olympic was withdrawn from service and sold for scrapping on 12 April 1935 which was completed in 1937.

An ocean liner is a type of passenger ship primarily used for transportation across seas or oceans. Ocean liners may also carry cargo or mail, and may sometimes be used for other purposes. Only one ocean liner remains in service today.