1972–73 Sussex County Football League

The 1972–73 Sussex County Football League season was the 48th in the history of Sussex County Football League a football competition in England.

Division One
Division One featured 13 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
 * Newhaven
 * Sidley United

Division Two
Division Two featured twelve clubs which competed in the division last season, along with one new club, relegated from Division One:
 * Lancing