William John Cullen (7 December 1894 – 28 June 1960) was an Irish rugby international. He won one cap against England in 1920. Cullen also played first-class cricket while in British India, playing eight first-class matches for the Europeans cricket team and a combined . He scored a total of 376 runs in his eight matches, at an average of 31.33 and a high score of 120, which came for the Europeans against the Muslims in the final of the 1927/28 Bombay Quadrangular. Cullen died in England in June 1960 at Hemingford Grey, Huntingdonshire.