The 1945–46 Sussex County Football League season was the 21st in the history of the competition.
[1][2] Teams were placed into two separate leagues, Eastern Division and Western Division.
With the winners of each league playing in a play-off to decide the overall winner.
The league featured 17 clubs, 11 which competed in the 1939–40 season, along with six new clubs: Haywards Heath 1 — 0 Worthing Source= Sussex County league - Historic League Tables