Miyan Ab District () is in Shushtar County, Khuzestan province, Iran. Its capital is the village of Arab Hasan.
After the 2011 census, Miyan Ab and Miyan Ab-e Shomali Rural Districts were separated from the Central District in the formation of Miyan Ab District, and the village of Sardarabad was elevated to city status as Sardaran.
At the time of the 2016 census, the district's population was 32,177 inhabitants in 8,395 households.