Gallup is a surname of English origin. Notable people with the surname include:
Albert Gallup (1796–1851), American politician
Alec Gallup (1928–2009), American pollster
Annie Gallup, American singer and songwriter
Barry Gallup, American football coach
Caroline Gallup Reed (1821-1914), American educator
Cliff Gallup (1930–1988), American guitarist
David Gallup (1808–1882), American politician
Dick Gallup (1941-2021), American poet
Donald Gallup (1913-2000), American bibliographer and curator
Elizabeth Wells Gallup (1848–1934), American educator and scholar
Felicity Gallup (born 1969), British badminton player
George Gallup (1901–1984), American pollster, creator of the Gallup Poll
George Gallup Jr. (1930–2011), American pollster, writer, and executive
Gordon G. Gallup (1941–2026), American psychologist
Harvey A. Gallup (1869–1946), American politician
John Gallup (1619-1675), English militia captain and early American settler
John Luke Gallup (born 1962), American economist
Lee Gallup (1896–1995), American politician
Michael Gallup (born 1996), American football player
Morris E. Gallup (1825–1893), American politician from Ohio
Simon Gallup (born 1960), British musician and bass guitarist
William H. Gallup, American politician, member of the 111th and 112th New York State Legislature
William Harrison Gallup (1840–1929), American politician