The Coastal Giant Salamander (Dicamptodon tenebrosus) is a species of salamander in the Dicamptodontidae family (Pacific giant salamanders). It is endemic to the United States and Canada. There are three closely related species to this taxon: D. ensatus (California Giant Salamander), D. copei (Cope's Giant Salamander), and D. aterrimus (Idaho Giant Salamander).