The 2016–17 season was the 102nd season of the Isthmian League, which is an English football competition featuring semi-professional and amateur clubs from London, East and South East England.
[3] The Premier Division consisted of 24 clubs: 18 clubs from the previous season, and six new clubs: Havant & Waterlooville were pronounced champions of the Premier Division on 22 April 2017,[4] and returned to the National League at the first attempt along with play-off winners Bognor Regis Town, who spent eight years in the Isthmian League after relegation from Conference South in 2009.
Harrow Borough were reprieved from relegation after Worcester City, who relegated from National League North took a further voluntary demotion to the Midland League for financial reasons.
The 2016–17 Alan Turvey Trophy sponsored by Robert Dyas (formerly the Isthmian League Cup) is the 43rd season of the Alan Turvey Trophy, the cup competition of the whole Isthmian League.
The Isthmian League Cup was voluntary this season, ten clubs decided not to take part in the competition: