Dashan Island, also known as Danianshan and Taibujiao, is an island in the East China Sea administered as part of Qiansandao, Lianyungang Prefecture, Jiangsu Province, China.
Dashan Island has an area of . It is part of the Qiansan Islands and is located from Lianyungang.
It is one of the baselines of the Chinese territorial sea and the PLA erected territorial sea steles on the island in 2006.