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- Gareth Chapman (born 1981), Welsh rugby union player
- Gary Chapman
- Gary Chapman (author), American relationship counselor and author of the The Five Love Languages series
- Gary Chapman (swimmer) (1937–1978), Australian swimmer and Olympic bronze medalist
- Gary Chapman (musician) (born 1957), American singer/songwriter and former television talk show host
- George Chapman
- George Chapman (1559–1634), English dramatist, translator, and poet
- George Chapman (murderer) (1865–1903), Polish serial killer, suspected by some as being Jack the Ripper. Born Seweryn Antonowicz Kłosowski
- George Chapman (healer) (1921–2006), British trance healer and medium
- George Henry Chapman (1832–1882), American Civil War General in the Union Army
- George W. Chapman, American lawyer and Democratic Party politician
- Georgina Chapman (born 1976), British fashion designer and actress
- Gerald Chapman
- Gerald Chapman (1891–1926), American criminal and gang leader of the Prohibition-era
- Gerald Chapman (director) (1949–1987), British theatre director
- Glenn Chapman (1906–1988), American baseball player
- Graham Chapman (1941–1989), British comedian and writer, member of Monty Python
- Grant Chapman (born 1949), Australian Liberal Party politician
- Grizz Chapman, American television actor, notable appearances in 30 Rock
- Guy Chapman (1889–1972), British author, historian and distinguished World War II soldier
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