1988–89 Sussex County Football League

The 1988–89 Sussex County Football League season was the 64th in the history of Sussex County Football League a football competition in England.

Division One
Division One featured 15 clubs which competed in the division last season, along with three new clubs:
 * Langney Sports, promoted from Division Two
 * Oakwood, promoted from Division Two
 * Redhill, transferred from the Spartan League

Division Two
Division Two featured twelve clubs which competed in the division last season, along with two new clubs:
 * Broadbridge Heath, promoted from Division Three
 * Horsham YMCA, relegated from Division One

Division Three
Division Three featured twelve clubs which competed in the division last season, along with four new clubs:
 * Falcons
 * Forest
 * Stamco, joined from the Southern Counties Combination
 * Wigmore Athletic, relegated from Division Two, who also changed name to Worthing United