Iranian football's 3rd division (Persian: ليگ دسته سوم ایران) is the fourth-highest football division overall in the Iranian football league system.

[1] Before 2001, the 3rd division league was the third-highest division in Iranian football league system, however, it became the fourth-highest division when Iran's football structure officially became professional.

Because of this, the 3rd division can be considered a regional league.

Stage one is played in single round-robin format and this is the only league organised by IRIFF which has no home-and-away format.

Top two teams of each group promote to second stage and join 20 teams which already have spots due to their performance in the previous season.