Kohgiluyeh and Boyer-Ahmad Province (Persian: استان کهگیلویه و بویراحمد, Ostān-e Kohgīlūye va Būyer-Ahmad ) (Luri: استان کهگیلویه و بِیرَمَد, Ostān-e Kohgīlūya-vo Beyramad ) is one of the thirty-one provinces of Iran
. It is in the south-west of the country, in Iran's Region 2, and its capital is Yasuj. The province covers an area of 15,563 square kilometers, and in 2006 had a population of 634,000. According to National Population and Housing Census population of Kohgiluyeh and Boyer-Ahmad in 2011 was 658,629. The people mainly speak Luri language. The counties of Kohgiluyeh and Boyer-Ahmad Province are Bahmai County, Landeh County, Boyer-Ahmad County, Charam County, Dana County, Basht County & Gachsaran County.