John Haynes
John Haynes may refer to:
- John Haynes , British draughtsman and engraver
- John Haynes , colonial governor of Massachusetts and Connecticut
- John Haynes , Australian journalist and politician
- John Haynes Jr., family physician, surgeon and community leader of Northwest Louisiana and Northeast Texas
- John Carmichael Haynes, Irish-born rancher, judge and public servant in British Columbia
- John Earl Haynes, American historian
- John Henry Haynes, American traveller, archaeologist, and photographer
- John Randolph Haynes, California socialist
- John C. Haynes & Co., American maker of musical instruments
- Johnny Haynes, English footballer