Gellatly is a surname. Notable people with the surname include:
Charlie Gellatly (1910–1973), British footballer Jessie Gellatly (1882–1935), British medical doctor Jim Gellatly (born 1968), Scottish radio presenter and DJ John Gellatly (1853–1931), American art collector and patron John Arthur Gellatly (1869–1963), American politician Stephen Gellatly (born 1980), New Zealand cricketer