Asir District () is in Mohr County, Fars province, Iran. Its capital is the city of Asir.
After the 2006 National Census, the village of Asir became a city.
At the time of the 2006 census, the district's population was 13,024 in 2,658 households. The following census in 2011 counted 11,195 people in 2,740 households. The 2016 census measured the population of the district as 14,003 inhabitants in 3,605 households.