The Central District of Dalahu County () is in Kermanshah province, Iran. Its capital is the city of Kerend-e Gharb.
After the 2011 National Census, the village of Shahrak-e Rijab, after merging with several other villages, was elevated to city status as Rizhaw.
At the time of the 2006 census, the district's population was 21,734 in 5,065 households. The following census in 2011 counted 21,741 people in 5,720 households. The 2016 census measured the population of the district as 20,215 inhabitants in 5,828 households.