Hailar District (Mongolian: ᠬᠠᠶᠢᠯᠠᠷ ᠲᠣᠭᠣᠷᠢᠭ Qayilar toɣoriɣ, Cyrillic: Хайлаар дүүрэг, Khailaar düüreg; simplified Chinese: 海拉尔区; traditional Chinese: 海拉爾區; pinyin: Hǎilā'ěr Qū) is an urban district that serves as the seat of the prefecture-level city Hulunbuir in northeastern Inner Mongolia, People's Republic of China. Hulunbuir, due to its massive size, is a city in administrative terms only, being mainly grassland and rural. Hailar, therefore, is a de facto city.