Jo(h)n Ham(m) may refer to:
- John Ham, MP for New Shoreham in 1433
- John Ham, co-founder of Ustream
- John E. Hamm (1776–1864), American colonel, doctor and politician
- John Hamm (born 1938), Canadian physician and politician
- Jon Hamm (born 1971), American actor, director and producer
- Jonathan Hamm (born 1985), former amateur boxer, actor, football player and current mixed martial artist
This disambiguation page lists articles about people with the same name.
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