The 1982–83 season was the 68th season of the Isthmian League, an English football competition.
Wycombe Wanderers were champions, winning their seventh Isthmian League title. There was no promotion from the Isthmian League to the Alliance Premier League till 1985. Worthing finished second in Division One achieving the second promotion in a row.
Premier Division
The Premier Division consisted of 22 clubs, including 20 clubs from the previous season and two new clubs, promoted from Division One: Bognor Regis Town Wokingham Town
At the end of the season Leytonstone & Ilford changed name into Leytonstone/Ilford.
League table
Division One
Division One consisted of 21 clubs, including 17 clubs from the previous season and four new clubs:
Two clubs relegated from the Premier Division: Boreham Wood Harlow Town
Two clubs promoted from Division Two: Cheshunt Worthing
League table
Division Two
Division Two consisted of 22 clubs, including 18 clubs from the previous season and four new teams:
Two clubs relegated from Division One: Clapton Ware
Two clubs joined from the Athenian League: Leyton-Wingate Uxbridge
At the end of the season Dorking Town were renamed Dorking.