Gregor is a surname, and notable people with the surname include:
A. James Gregor (1929–2019), professor of political science known for his writings on fascism and security issues
Bob Gregor (born 1957), American football player
Čestmír Gregor (1926–2011), Czech composer
Francis Gregor (MP) (1760–1815), MP for the County of Cornwall, brother of William
Gréta Gregorová (born 2001), Slovak politician
Joseph Gregor, (1888-1960), Austrian writer, theater historian and librettist
Kurt Gregor (1907–1990), German socialist politician
Michael Gregor (1888—1953), aircraft engineer
Noah Gregor (born 1998), ice hockey player
Valentin Gregor (born 1963), jazz violinist, singer and composer
Walter Gregor (1825–1897), folklorist
William Gregor (1761–1817), British clergyman and mineralogist who discovered the elemental metal titanium, brother of Francis
Gregor (musician) (1898–1971), Armenian bandleader