John Hammond may refer to:

• John Hammond (record producer) (1910–1987), American record producer
• John P. Hammond (born 1942), American blues guitarist, son of the record producer
• John A. Hammond (1843–1939), Canadian painter
• John Hammond (actor), lead actor in The Blue and the Gray miniseries (1982)
• John Hammond, film character in 31 North 62 East
• John Hammond (Jurassic Park), a fictional character in the Jurassic Park series

• John Hannam (died 1559), aka John Hammond
• John Hammond (died 1589) (1542–1589), MP for Rye and West Looe
• John Hammond (Irish politician) (1842–1907), British politician for Carlow County
• John Hammond (Wisconsin politician) (1814–?), Wisconsin farmer and legislator
• John Hammond (U.S. Representative) (1827–1889), New York manufacturer and politician
• John Wilkes Hammond (1837–1922)), American jurist

• John Hammond (bobsleigh) (born 1933), British Olympic bobsledder
• John Hammond (cricketer) (1769–1844), English cricketer
• Johnny Hammond (rugby union) (1860–1907), British rugby
• John Hammond (Canadian football) (1923–?), Canadian Football League player
• John S. Hammond (fl. 1930s), American sport administrator
• John Hammond (basketball) (born 1954), American sport business manager
• John Hammond (racehorse trainer) (born 1960), British horse trainer

• John Hays Hammond (1855–1936), American mining engineer
  • SS John H. Hammond, a Liberty ship
• John Hays Hammond Jr. (1888–1965), American electrical engineer
• John Hammond (physiologist) (1889–1964), British physiologist
• John Hammond (weather forecaster) (born 1966), weather forecaster for the BBC
• John Lawrence Hammond (1872–1949), English historical writer
• John Brown Hammond (1856–1938), American activist
• John C. Hammond (1842–1926), lawyer in the Commonwealth of Massachusetts
• John Hammond (priest), Church of England archdeacon

• Jack Hammond (1891–1942), American baseball player
• Jack Hammond (footballer) (1884–1971), Australian rules footballer
• Jay Hammond (1922–2005), governor of Alaska 1974–1982
• Johnny Hammond (disambiguation)
• John Hammond Jr. (disambiguation)