Acanthophis is a genus of elapid snakes. Commonly called death adders, they are native to Australia, New Guinea and nearby islands, and are among the most venomous snakes in the world. Despite their common name and resemblance to many species of viper, they belong to a different family, the Elapidae. The genus name comes from Ancient Greek ἄκανθα (ákantha), meaning "spine", and ὄφις (óphis), meaning "snake", referring to the spine on the death adder's tail.

Eight species are listed by ITIS, though it remains unclear how many species this genus includes, with figures ranging from 4 to 15 species being quoted.

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