The Central District of Aliabad-e Katul County () is in Golestan province, Iran. Its capital is the city of Aliabad-e Katul.
In 2013, the villages of Mazraeh and Sangdevin were converted to cities.
At the time of the 2006 census, the district's population was 89,204 in 21,632 households. The following census in 2011 counted 95,462 people in 27,211 households. The 2016 census measured the population of the district as 97,957 inhabitants in 30,060 households.