Gerrhonotus farri, also known commonly as Farr's alligator lizard and the Tamaulipan alligator lizard, is a species of lizard in the family Anguidae. The species is native to northeastern Mexico.
The specific name, farri, is in honor of American herpetologist , who collected the holotype.
G. farri is endemic to the Mexican state of Tamaulipas.
The holotype of G. farri has a snout-to-vent length (SVL) of . It has smooth dorsal scales, and its head is distinctly wider than its neck.
The mode of reproduction of G. farri is unknown.