William Greig

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