RMS Celtic was an ocean liner owned by the White Star Line. The first ship larger than the SS Great Eastern in gross tonnage (it was also longer), Celtic was the first of a quartet of ships over 20,000 tons, dubbed The Big Four. Celtic was launched on 4 April 1901 from the Harland and Wolff shipyards in Belfast, and set off on her maiden voyage from Liverpool to New York on 26 July.