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