Leptophis stimsoni, commonly known as the grey lora or the Trinidad upland parrot snake, is a small species of snake in the family Colubridae. The species is endemic to the Republic of Trinidad and Tobago.
L. stimsoni is known from less than a dozen specimens, all of which were collected in montane forests in the Northern Range on the Island of Trinidad, at altitudes of .
L. stimsoni is oviparous.
The specific name, stimsoni, is in honor of British herpetologist Andrew Francis Stimson.