Khorramabad District () is in Tonekabon County, Mazandaran province, Iran. Its capital is the city of Khorramabad.
In 2020, Baladeh-ye Sharqi Rural District was established in the district, and Do Hezar and Seh Hezar Rural Districts were separated from it in the formation of Kuhestan District
At the time of the 2006 National Census, the district's population was 37,517 in 10,453 households. The following census in 2011 counted 40,263 people in 12,804 households. The 2016 census measured the population of the district as 41,006 inhabitants in 14,111 households.