|Country||People's Republic of China|
|Township-level divisions||9 subdistricts
1 ethnic township
|District seat||Huayuan Subdistrict (花园街道)|
|• Total||1,443 km2 (557 sq mi)|
|Elevation||134 m (440 ft)|
|• Density||140/km2 (350/sq mi)|
|Time zone||China Standard (UTC+8)|
Aigun District (simplified Chinese: 瑷珲区; traditional Chinese: 瑷琿區; pinyin: Àihún Qū) is an administrative district and the seat of the prefecture-level city of Heihe, Heilongjiang Province, People's Republic of China. It is located on the right (south-western) bank of the Amur River, across which is Blagoveshchensk, Amur Oblast, Russia. According to the prefectural government, the land area of Aigun District is 1,443 km2 (557 sq mi), the population is 197,240 people.[when?] On 17 May 2015 the district name was revert back to the original from Aihui (爱辉) to Aigun (瑷珲).
- Huayuan Subdistrict (花园街道), Xing'an Subdistrict (兴安街道), Xixing Subdistrict (西兴街道), Hailan Subdistrict (海兰街道)
- Xingfu Township (幸福乡), Sijiazi Manchu Ethnic Township (四嘉子满族乡), Kunhe Daur and Manchu Ethnic Township (坤河达斡尔族满族乡), Shangmachang Township (上马厂乡), Zhangdiyingzi Township (张地营子乡), Xifengshan Township (西峰山乡), Xinsheng Oroqen Ethnic Township (新生鄂伦春族乡), Erzhan Township (二站乡)
In 1913 Aigun became the county seat of the newly created Aigun County (瑷珲县, Aihun xian), which was in December 1956 renamed Aihui County (爱辉县). On November 15, 1980, Heihe City was created, and on June 6, 1983, Aihui County was abolished, being merged into the Heihe City.
To further complicate the situation, in 1993 the former Heihe City (a county-level administrative unit) was reorganized into Aihui District (also a county-level unit), while the former Heihe Prefecture (黑河地区) became Heihe Prefecture-level City (which consists of Aihui District and a number of counties). This administrative division has been in effect ever since.