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
- 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 (born 1941), 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
- Michael Gallup (born 1996), American football player
- Morris E. Gallup (1825–1893), American politician from Ohio
- Simon Gallup (born 1960), British musician and guitarist
- Mitchell Gallup (born 2006), #1 JROTC Archer in SDUSD 2024