The 2009–10 Northern Football League season was the 112nd in the history of Northern Football League, a football competition in England.
[1] Division One featured 19 clubs which competed in the division last season, along with three new clubs, promoted from Division Two: Also, Dunston Federation changed name to Dunston UTS.
Division Two featured 16 clubs which competed in the division last season, along with four new clubs: Also, Stokesley Sports Club changed name to Stokesley.