Symphimus mayae, also known commonly as the Yucatán white-lipped snake and la culebra labio-blanco yucateca in New World Spanish, is a species of snake in the subfamily Colubrinae of the family Colubridae. The species is native to the Yucatán Peninsula.
The specific name, mayae, is in honor of the Maya, an indigenous people of the Yucatán Peninsula.
Symphimus mayae is found in Belize, Guatemala, and Mexico (Campeche, Quintana Roo, Yucatán).
The preferred natural habitat of Symphimus mayae is forest, at altitudes from sea level to .
Symphimus mayae is both terrestrial and semiarboreal, and it is diurnal.
Symphimus mayae preys predominately upon orthopterans such as crickets (family Gryllidae) and katydids (family Tettigoniidae).
Symphimus mayae is oviparous.