Tantilla petersi, also known commonly as Peters's black-headed snake, is a species of snake in the subfamily Colubrinae of the family Colubridae. The species is endemic to Ecuador.
The specific name, petersi, is in honor of American herpetologist James Arthur Peters (1922âÂÂ1972).
Tantilla petersi is found in northern Ecuador, in Imbabura Province.
The preferred natural habitat of Tantilla petersi is shrubland, at altitudes of .
Tantilla petersi is oviparous.