Hoseynabad District () is in Sanandaj County, Kurdistan province, Iran. Its capital is the city of Hoseynabad.
In 2011, Hoseynabad-e Jonubi Rural District was separated from the Central District, and Hoseynabad-e Shomali Rural District was separated from Saral District of Divandarreh County in the formation of Hoseynabad District. After the 2016 National Census, the village of Hoseynabad was elevated to the status of a city.
At the time of the 2016 census, the district's population was 9,743 inhabitants in 2,748 households.