南方鲎（学名Tachypleus gigas），又名巨鲎，是一种鲎。它们分布在印度、印尼、马来西亚、菲律宾、新加坡、中国及泰国。

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Tachypleus gigas, one of the four extant species of horseshoe crab, is found in shallow water in Southeast Asia at depths to 40 m (130 ft). It grows up to 39 cm (15 in) long and 17.5 cm (6.9 in) wide, and is covered by a sturdy carapace, with a long caudal spine (tail).