Geophis sanniolus, commonly known as the pygmy snail-eating snake or the pygmy snail sucker, is a species of small snake in the family Colubridae.

The species is endemic to Central America and southeastern Mexico.

G. sanniolus is found in Belize, Guatemala, and the Mexican states of Campeche, Quintana Roo, and Yucatán.

[1] G. sanniolus reaches sexual maturity in eight months and produces a single clutch per year.

The subspecific name, neilli, is in honor of American herpetologist Wilfred T.