1990–91 Sussex County Football League

The 1990–91 Sussex County Football League season was the 66th in the history of Sussex County Football League a football competition in England.

Division One
Division One featured 16 clubs which competed in the division last season, along with two new clubs, promoted from Division Two:
 * Bexhill Town
 * Oakwood

Division Two
Division Two featured twelve clubs which competed in the division last season, along with four new clubs.
 * Clubs relegated from Division One:
 * Lancing
 * Redhill
 * Clubs promoted from Division Three:
 * Sidley United
 * Worthing United

Division Three
Division Three featured eleven clubs which competed in the division last season, along with two new clubs, relegated from Division Two:
 * Ferring
 * Storrington