John Mercer may refer to:
- John Francis Mercer (1759–1821), American statesman, delegate to the Constitutional Convention
- Captain John Mercer (died 1756), colonial Virginia militiaman killed at the Battle of Great Cacapon
- John Mercer (colonial lawyer) (1704–1768), colonial Virginia lawyer
- John Francis Mercer (1759–1821), Governor of Maryland, 1801–1803, son of the Virginia lawyer
- John Mercer (scientist) (1791–1866), British textile chemist
- John Mercer (Australian pastoralist) (1823–1891), Australian pastoralist and politician, see Members of the Victorian Legislative Council, 1851–1853
- John Mercer (baseball) (1892–1982), Major League Baseball first baseman
- John Mercer (archaeologist) (1934–1982), British archaeologist and author
- Johnny Mercer (1909–1976), American songwriter
- Jack Mercer (1910–1984), American animator
- Jack Mercer (cricketer) (1893–1987), cricketer for Glamorgan
Famous quotes containing the words john and/or mercer:
“Now John wore clothing of camel’s hair with a leather belt around his waist, and his food was locusts and wild honey.”
—Bible: New Testament, Matthew 3:4.
“We’re after the same rainbow’s end waitin’ round the bend, my Huckleberry friend.”
—Johnny Mercer (1909–1976)