The 2009–10 Sussex County Football League season was the 85th in the history of Sussex County Football League a football competition in England.
[1][2] Division One featured 16 clubs which competed in the division last season, along with four new clubs.
Also, Chichester City United changed name to Chichester City.
Division Two featured 13 clubs which competed in the division last season, along with five new clubs.
Division Three featured twelve clubs which competed in the division last season, along with three new clubs: