Sumichrast's garter snake (Thamnophis sumichrasti ) is a species of snake in the family Colubridae. The species is endemic to Mexico.
The specific name sumichrasti is in honor of the Swiss-born Mexican naturalist Adrien Jean Louis François de Sumichrast (1828–1882).
Thamnophis sumichrasti is found in the Mexican states of Chiapas, Hidalgo, Oaxaca, Puebla, Querétaro, San Luis Potosí, Tabasco, and Veracruz.
The preferred natural habitats of T. sumichrasti are freshwater wetlands and forest.
T. sumichrasti is viviparous.