The Central District of Ashtian County () is in Markazi province, Iran. Its capital is the city of Ashtian.
At the time of the 2006 National Census, the district's population was 19,011 in 5,669 households. The following census in 2011 counted 17,105 people in 5,536 households. The 2016 census measured the population of the district as 16,357 inhabitants in 5,582 households.