三齿鲀（学名：Triodon macropterus）为辐鳍鱼纲鲀形目四齿鲀亚目三齿鲀科下唯一属三齿鲀属下的唯一的现存鱼类，又名长鳍三齿鲀。按照化石记录，这个科下其它物种从始新世开始出现。现在分布于印度洋和太平洋西部，如**附近等，栖息深度50-300公尺，体长可达54公分。该物种的模式产地在毛里求斯 。

三齿鲀体型独特，肚子上有一片和身体差不多大的皮，皮上还有一个像眼睛的斑。感觉危险时它吸进海水，涨满这张皮，使得体积翻倍，吓走猎户。

Triodon macropterus also known as the Threetooth puffer is a tetraodontiform fish, the only living species in the genus Triodon and family Triodontidae. Other members of the family are known from fossils stretching back to the Eocene.

It is native to the Indo-Pacific, where found at depths to 300 m (980 ft). Its name comes from the Greek tria meaning "three" and odous meaning "tooth", and refers to the three fused teeth making up a beak-like structure.