William Greig may refer to: William Greig (politician) (1840–1918), farmer, lumber merchant and political figure in Quebec William Greig (songwriter), Newcastle songwriter W. D. O. Greig (William Dallas Ochterlony Greig), English footballer William Greig, Scottish prisoner of war during WWII who escaped and played a role in the Battle for Czech Radio
See also James Greig (British politician) (James William Greig, 1859–1934), British barrister and politician William Greg, essayist William Gregg (disambiguation)