John Spencer can refer to different people:

Earls

• John Spencer, 1st Earl Spencer (1734-1783)
• John Spencer, 3rd Earl Spencer (1782-1845) was a British politician.
• John Spencer, 5th Earl Spencer (1835-1910) was a British politician.

Others

• John Spencer (British politician) (1708-1746), father of the 1st Earl Spencer.
• John Canfield Spencer (1788–1855) American politician
• John Spencer (snooker player) (1935-2006) was an English snooker player.
• John Spencer (actor) (1946-2005) was an American actor in television series including L.A. Law and The West Wing.
• John Spencer (politician) (born 1946), is the former Republican mayor of Yonkers, New York from 1995 to 2003 who is running for the United States Senate against Hillary Rodham Clinton in U.S. Senate election, 2006.
• John Spencer (footballer) (born 1970), is a former Scottish football player.

See also

• Jon Spencer Blues Explosion, New York band
• John Spencer-Churchill