The 1983–84 Sussex County Football League season was the 59th in the history of Sussex County Football League a football competition in England. It also was the first season for the league to consist of three divisions.[1][2]
Division One featured 14 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
Division Two featured 13 clubs which competed in the division last season, along with three new clubs: