J
- Jake Chapman (born 1966), English conceptual artist
- James Chapman
- James Chapman (author) (born 1955), American novelist and publisher
- James Chapman (Bishop of Colombo) (died 1879), first Bishop of Colombo (Anglican) in Sri Lanka
- James Walter Chapman-Taylor (1878–1958), New Zealand domestic architect
- Jan Chapman (born 1950), Australian film producer
- Janice Chapman Australian-born British singer and voice coach
- J.B. Chapman (1884–1947), American minister and president of Arkansas Holiness and Peniel Colleges
- Jeff Chapman
- Jeff Chapman (1973–2005); Canadian urban-explorer, fountineer, author and editor. Also known as Ninjalicious
- Jeff Chapman (Georgia politician), American politician
- Jenny Chapman (born 1973), British Labour politician
- Jessica Chapman (1991–2002), murder victim of Ian Huntley
- Jim Chapman
- Jim Chapman (born 1945), American politician, Democratic Congressman representing Texas
- Jim Chapman (footballer), Scottish footballer and football manager
- Jim Chapman (Canadian), Canadian radio and TV personality, musician, journalist and author
- John Chapman
- Johnny Appleseed or John Chapman (1774–1847), American pioneer orchardist and Swedenborgian Christian missionary
- John Chapman (footballer), English manager of Manchester United football team
- John Chapman (publisher) (1821–1894), British publisher and physician
- John Chapman (congressman) (1740–1800), American Federalist Party politician
- John Chapman (priest) (1865–1933), British Roman Catholic priest
- John Chapman (artist) (born 1946), British artist
- John David "J.D." Chapman (born 1983), American heavyweight boxer
- John Gadsby Chapman (1808–1889), American artist
- John Grant Chapman (1798–1856), American Whig Party politician
- John Herbert Chapman (1921–1979), Canadian space researcher from London, Ontario
- John Jay Chapman (1862–1933), American author and essayist
- John Wilbur Chapman (1859–1918), American Presbyterian evangelist
- Johnny Chapman (born 1967), American race car driver in the NASCAR Nationwide series
- Jonathan Chapman (1807–1848), American politician and mayor of Boston
- Jonathan Chapman (born 1975) British academic, consultant and writer
- Joseph Chapman
- Joseph Chapman (actor), American television actor
- Union Jack (Joseph Chapman), Fictional British superhero
- Joseph A. Chapman, American President of North Dakota State University
- Judith Chapman (born 1945), American actress
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