John Diamond

John Diamond may refer to:


 * John Diamond (bridge), American bridge player
 * John Diamond (dancer) (1823–1857), Irish-American dancer
 * John Diamond (journalist) (1953–2001), British broadcaster and journalist
 * John Diamond, Baron Diamond (1907–2004), British Labour politician
 * Jon P. Diamond (born 1957), American entrepreneur
 * John T. Diamond (1912–2001), New Zealand historian
 * John Diamond (doctor) (1934–2021), American doctor
 * John Diamond, 1980 children's novel by author Leon Garfield