John Ham

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