|Date of birth||2 May 1945|
|Place of birth||Barnehurst Kent, England|
|1979–81||Tampa Bay Rowdies (indoor)||2||(0)|
|1979–1982||Tampa Bay Rowdies (assistant)|
|2011||Charlton Athletic (caretaker)|
|* Senior club appearances and goals counted for the domestic league only|
Peacock played his entire professional career for Charlton Athletic, making over 500 Football League appearances between 1962 and 1979. On 21 August 1965, while playing for Charlton, he became the first substitute ever to be used in the Football League when he replaced injured goalkeeper Mike Rose after 11 minutes of an away match against Bolton Wanderers.
He played for the Columbus Magic of the ASL before joining his old friend Gordon Jago as his assistant manager and player at the Tampa Bay Rowdies in the North American Soccer League until 1982. Peacock's last appearance as a player for the Rowdies was during the 1980–81 indoor season.
Peacock was manager of Gillingham between 1981 and 1987 and then Maidstone United between 1989 and 1991. He later served as assistant manager at Charlton Athletic before stepping down after the resignation of Alan Curbishley in 2006. He moved to West Ham United where he became first a scout and then assistant manager under Alan Pardew and Alan Curbishley. He ended this role at the end of the 2006–07 season.
In September 2007 Peacock returned to Charlton in the role of honorary associate director.
Peacock married Lesley and has a son, Gavin (born 1967), who also became a professional footballer. He also has a daughter called Lauren and four grandchildren. In 2004, his autobiography No Substitute was published by Charlton Athletic. In 2013, he was Inducted into the Charlton Athletic Hall of Fame.
- Hugman, Barry J. (1984). Canon League Football Players' Records 1946-1984. Newnes Books. p. 374. ISBN 0-6003-7318-5.
- Charlton Athletic post-war player statistics
- The Guardian
- West Ham official website
- Peacock announced as Addicks ambassador
- Gavin Peacock's official website
- Cascarino, Tony (31 May 2008). "Gavin Peacock convinced God is on his side". London: The Times. Retrieved 2008-05-31.