The 1963–64 Southern Football League season was the 61st in the history of the league, an English football competition.
Seven Southern League clubs applied to join the Football League at the end of the season, but none were successful.
The Premier Division consisted of 22 clubs, including 18 clubs from the previous season and four new clubs, promoted from Division One: Also, Bexleyheath & Welling changed name to Bexley United.
Division One consisted of 22 clubs, including 16 clubs from the previous season and six new clubs: Also, Tunbridge Wells United changed name to Tunbridge Wells Rangers.
At the end of the season, Yiewsley changed name to Hillingdon Borough, while Clacton Town switched to the Eastern Football League.