Hajjilar District (Persian: بخش حاجیلار) is in Chaypareh County, West Azerbaijan province, Iran.

[3] After the 2006 National Census, Chaypareh District was separated from Khoy County in the establishment of Chaypareh County, which was divided into two districts of two rural districts each, with Qarah Zia ol Din as its capital and only city at the time.

[3] After the 2016 census, the village of Hajjilar was elevated to the status of a city.

[4] At the time of the 2011 census, the district's population was 8,683 people in 2,291 households.

[5] The 2016 census measured the population of the district as 8,360 inhabitants in 2,350 households.