Atheris ceratophora is a venomous viper species endemic to a few mountain ranges in Tanzania.

This used to be the only horned, arboreal viper known from Africa, until the discovery in 2011 of Atheris matildae, also found in Tanzania.

[6] It grows to a maximum total length (body + tail) of 54 cm (21 in).

[7] Easily recognized by a set of 3-5 horn-like superciliary scales above each eye.

The first 3 lower labials on each side are in contact with the one pair of chin shields.