Tachypleus tridentatus, commonly known as the Chinese horseshoe crab, Japanese horseshoe crab, or tri-spine horseshoe crab, is a species of horseshoe crab found in Southeast and East Asia, with records from China, Indonesia, Japan, South Korea, Malaysia, the Philippines, Taiwan, and Vietnam. It is found in coastal marine and brackish waters, and tolerates colder temperatures than the other Asian horseshoe crabs (Tachypleus gigas and Carcinoscorpius rotundicauda), although juveniles still need water warmer than 22 °C (72 °F) to moult.

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