Anhai[a] is a town in southern Fujian province or Minnan, People's Republic of China.

It is located in the far southern suburbs of the Quanzhou metropolitan area and is separated by Weitou Bay (simplified Chinese: 围头湾; traditional Chinese: 圍頭灣; Pe̍h-ōe-jī: Ûi-thâu-oân) from Kinmen, which is controlled by the Republic of China on Taiwan.

Administratively, Anhai is part of Jinjiang County-level City, which in its turn is subordinated to Quanzhou.

The 19th-century researchers writing for the Hakluyt Society thought Anhai was the port of "Tansuso" visited by Martín de Rada, but later research identified Tansuso as Zhongzuosuo (Chinese: 中左所; Pe̍h-ōe-jī: Tiong-chó-só͘), which is in modern Xiamen, some 40 km (25 mi) to the west.

[3] Anhai regained importance in the later 19th century when sand bars created by the Jin and Luo rivers blocked the principal harbor for Quanzhou; the city retained its size and importance to local trade but maritime commerce was redirected to Anhai.