John Hammond may refer to:

• John A. Hammond (1843-1939), Canadian painter
• John E. Hammond (b. 1960), horse trainer in France
• John H. Hammond (1910-1987), American record producer
• John Hays Hammond (1855-1936), American mining engineer
• John Hays Hammond, Jr. (1888-1965), son of the mining engineer, American developer of radio control
• John Lawrence Hammond (1872-1949), English historical writer
• John P. Hammond (born 1942), called "John Hammond Jr.", American blues musician, son of the producer
• John Hammond (weather forecaster), a weather forecaster for the BBC.

• John Hammond, fictional character in the novel Jurassic Park. See List of characters in Jurassic Park.

John Hammond