Mixcoatlus browni (commonly known as Brown's montane pit viper, sometimes Mexican Montane pitviper) is a species of pit viper found at high elevations in Guerrero, Mexico. This species was previously placed in the Agkistrodon genus, where it was considered to be a junior synonym of Cerrophidion barbouri. Molecular evidence has since demonstrated that M. browni is a distinct species and the genus name was subsequently changed.