1978–79 Sussex County Football League

The 1978–79 Sussex County Football League season was the 54th in the history of Sussex County Football League a football competition in England.

Division One
Division One featured 14 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
 * Sidley United
 * Steyning

Division Two
Division Two featured twelve clubs which competed in the division last season, along with two new clubs relegated from Division One:
 * Selsey
 * Wigmore Athletic