Donglai Commandery () was a historical Chinese commandery on the Jiaodong Peninsula, existing from Han dynasty to Tang dynasty.
Donglai Commandery was likely established during Emperor Jing of Han's reign on the lands of Jiaodong Commandery. In late Western Han dynasty, its territory included 17 counties and marquessates, namely Ye (掖), Chui (腄), Pingdu (平度), Huang (黃), Linqu (臨朐), Qucheng (曲成), Muping (牟平), Dongmu (東牟), Zang (脏), Yuli (育犁), Changyang (昌陽), Buye (不夜), Dangli (當利), Luxiang (盧鄉), Yangle (陽樂), Yangshi (陽石), and Xuxiang (徐鄉). In 140 AD during Eastern Han, the number of counties and marquessates was 13, including Huang, Muping, Jian (惤), Qucheng, Ye, Dangli, Dongmu, Changyang, Luxiang, Gelu (葛盧), Changguang (長廣), Qianzou (黔陬), and Buqi (不其), the last three of which were formerly part of Langya Commandery. During the Jian'an (建安) era of early 3rd century, Qianzou was transferred to the newly established Chengyang Commandery. Also during Jian'an Era, Changguang Commandery was established on the territory of Donglai and Beihai, covering 6 counties, although by 213 AD the commandery would have been dissolved, and the counties merged back into their respective original commanderies. Changguang Commandery was later restored in 277 AD.
In 280 AD, after the unification of China proper under the Jin dynasty, Donglai administered 6 counties. After the Disaster of Yongjia, the commandery was successively ruled by Later Zhao, Former Yan, Former Qin and Southern Yan, until it was conquered by Liu Yu of the Liu Song dynasty. Northern Wei conquered the region during Emperor Ming of Song's reign. The commandery was eventually abolished in early Sui dynasty.Book of Sui, Chapter 30.
In Sui and Tang dynasties, Donglai Commandery became the alternative name of Lai Prefecture. In 692, several counties were separated to form the new Deng Prefecture, later also known as Dongmu Commandery. In 742, the commandery's reduced territory covered 4 counties: Ye, Changyang, Jimo and Jiaoshui (膠水, formerly Changguang).New Book of Tang, Chapter 38.
Population DynastyWestern HanEastern HanWestern JinLiu SongNorthern WeiSui dynastyTang dynastyYear2140280464534609742Households103,292Book of Han, Chapter 28.104,297Book of Later Han, Chapter 112.6,500Book of Jin, Chapter 15.10,131Book of Song, Chapter 36.19,195Book of Wei, Chapter 106.90,35126,998Population502,693484,393 75,14962,044 171,516
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