Dadeng Subdistrict (Chinese: 大嶝街道; pinyin: Dàdèng Jiēdào) is a group of three islands under the de facto administration of the People's Republic of China as part of Xiang'an District of Xiamen in southern Fujian, but is also claimed by the Republic of China and historically constituted as an insular subdistrict in Kinmen County (Quemoy).

From the Song dynasty to the early Republican China period, the area was part of Xiangfeng Li (翔風里).

In 1914, the present-day Dadeng Subdistrict area became part of Xiamen's Siming County.

In 1915, the present-day Dadeng Subdistrict area became part of Kinmen County (Quemoy).

Japan occupied Kinmen County (Quemoy) during the Second Sino-Japanese War from 1937 to 1945. During this period, the county government was moved to Dadeng.

The islands have been under PRC control since October 9 or October 15, 1949 initially as part of Nan'an County. On the day of Qingming Festival in 2005, a monument to the more than 300 PLA soldiers who died during the struggle was erected on Dadeng Island.

In the lead-up to the Battle of Kuningtou in late October 1949, the PLA gathered forces in Aotou (澳頭) (in Xindian, Xiamen), Dadeng (Tateng) and Lianhe (Lienho) (蓮河) (then part of Nan'an County, now also in Xindian).

Dadeng District (大嶝區) was established in 1949.