三疣梭子蟹（学名：Portunus trituberculatus）为梭子蟹科梭子蟹属的动物。

头胸甲宽大，两侧具有长棘，略呈梭形；暗紫色，有青白色云斑；蟹足长大，第四对步足扁平似桨，适合于游泳。

Portunus trituberculatus, the gazami crab, Japanese blue crab or horse crab, is the most widely fished species of crab in the world. It is found off the coasts of East Asia and is closely related to Portunus pelagicus.