Ab Behan (Persian: ابهان, also Romanized as Āb Behān; also known as Chashmeh-ye Āb Bāhūn and Cheshmeh-ye Āb Bāhūn) is a village in Bahmai-ye Garmsiri-ye Jonubi Rural District, in the Central District of Bahmai County, Kohgiluyeh and Boyer-Ahmad Province, Iran. At the 2006 census, its population was 21, in 5 families.