John Gregg
John Gregg may refer to:
Politicians
- John Gregg (Guildford MP), English MP for Guildford
- John Gregg (Texas politician), American politician from Texas who was killed in action during the American Civil War
- John R. Gregg, American politician from Indiana
Religion
- John Gregg (bishop of Cork), Anglican Bishop of Cork, Cloyne and Ross, 1862–1878
- John Gregg (archbishop of Armagh), Anglican Archbishop of Armagh 1939–1959
Others
- John Irvin Gregg, United States Army general
- John Robert Gregg, Irish-born American inventor of Gregg shorthand
- John P. Gregg, head football coach at Louisiana State University, 1899
- John William Gregg, American landscape architect
- John Gregg, companion of philanthropist Robert Allerton
- John Gregg (baker), British founder of Greggs bakery
- John Gregg (actor), Australian actor
- John Gregg (loyalist), Ulster loyalist, member of the UDA