John Mercer
John Mercer is the name of:
- Captain John Mercer, colonial Virginia militiaman killed at the Battle of Great Cacapon
- John Mercer , colonial Virginia lawyer
- John Francis Mercer, American Governor of Maryland, 1801–1803, son of the Virginia lawyer
- John H. Mercer, American Ohio State University glaciologist
- John Mercer , British textile chemist
- John Mercer , Australian landowner, pastoralist and politician in colonial Victoria
- John Mercer , American Major League Baseball first baseman
- John Mercer , British archaeologist and author
- John Mercer , American legislator in the state of Montana
- John Mercer , New Zealand photographer and photojournalist
- Johnny Mercer, American songwriter
- Johnny Mercer , British politician
- Jack Mercer, American animator and voice actor
- Jack Mercer , British cricketer for Glamorgan
- Jack Mercer , Major League Baseball pitcher