1964–65 Sussex County Football League

The 1964–65 Sussex County Football League season was the 40th 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 two new clubs, promoted from Division Two:
 * Seaford Town
 * Selsey

Division Two
Division Two featured twelve clubs which competed in the division last season, along with six new clubs:
 * APV Athletic, relegated from Division One
 * Ferring
 * Sidley United, relegated from Division One
 * Steyning, joined from the Brighton, Hove & District League
 * Wadhurst
 * Wick, joined from the West Sussex League

Also, Three Bridges United changed name to Three Bridges.