Science
- John Bell (surgeon) (1763–1820), Scottish anatomist and surgeon
- John Bell (mathematician) (born 1954), American mathematician
- John Graham Bell (1812–1899), American taxidermist
- John Irving Bell (born 1952), British–Canadian biologist
- John Lane Bell (born 1945), mathematician and philosopher
- John Stewart Bell (1928–1990), physicist from Northern Ireland
- John Cameron Bell (born 1953), Canadian cancer researcher
Read more about this topic: John Bell