Lig for sponsorship reasons, is the fourth level in the Turkish football league system.
It was founded in the 2001–02 season as a continuation of then third level division Turkish Third Football League.
The higher ranked clubs in the league have the home advantage in the second game.
The bottom three teams in each group are relegated to Turkish Regional Amateur League.
Two teams relegated from Turkish Second Football League: Beyoğluspor, Davutpaşa.
Tekirdağspor, Çanakkalespor, Çorumspor, Elazığspor, Muğlaspor, Düzcespor, Eskişehir Demirspor, Kırıkkalespor, Nazillispor (founded in 1967 and dissolved in 1975), Konya İdman Yurdu, Tarsus İdman Yurdu, Ceyhanspor, Lüleburgazspor, Tekirdağspor, İskenderunspor, and Hatayspor were other teams whose applications were accepted by TFF.
At the end of the season winner promoted to TFF Second League, no team relegated.
Bottom three teams in each group were relegated to Turkish Regional Amateur League.
Bottom four teams in each group were relegated to Turkish Regional Amateur League.
Bottom three teams in each group are relegated to Turkish Regional Amateur League.
4 teams relegated from 2012–13 TFF Second League: Denizli Belediyespor, Çamlıdere Şekerspor, Ünyespor, Sakaryaspor.
Bottom three teams in each group are relegated to Turkish Regional Amateur League.
Promotion from Turkish Regional Amateur League: Trabzon Düzyurtspor, Yeni Diyarbakırspor, 1930 Bafraspor, Payas Belediyespor 1975, 68 Yeni Aksarayspor, Adliyespor, Kızılcabölükspor, Balçova Belediyespor, Ayvalıkgücü Belediyespor, Çıksalınspor and Tuzlaspor[10] Promotion and relegation: Source: TFF Third League archive.
6 teams relegated from 2012–13 TFF Second League: Çanakkale Dardanelspor, Gaziosmanpaşaspor, Çankırıspor, Eyüpspor, İstanbul Güngörenspor and Bozüyükspor.
Bottom three teams in each group are relegated to Turkish Regional Amateur League.
Promotion from Turkish Regional Amateur League: Bayburt İl Özel İdarespor, Erzin Belediyespor, Niğde Belediyespor, Etimesgut Belediyespor, Çine Madranspor, Tire 1922 Spor, Zonguldak Kömürspor, Çatalcaspor and Halide Edip Adıvar SK[12] Promotion and relegation: In 2015–16 season league is played with 57 teams in three groups, 18 in each.
6 teams relegated from 2012–13 TFF Second League: Çanakkale Dardanelspor, Gaziosmanpaşaspor, Çankırıspor, Eyüpspor, İstanbul Güngörenspor and Bozüyükspor.
Bottom four teams in each group are relegated to Turkish Regional Amateur League.