The Central District of Qasr-e Shirin County () is in Kermanshah province, Iran. Its capital is the city of Qasr-e Shirin.
At the time of the 2006 National Census, the district's population was 19,574 in 4,920 households. The following census in 2011 counted 23,665 people in 5,984 households. The 2016 census measured the population of the district as 22,702 inhabitants in 6,688 households.