The ladder snake (Rhinechis scalaris) is a species of non-venomous snake in the family Colubridae which is found in southwestern Europe.
This species is found through much of Portugal and Spain (it is absent from much of northernmost Spain) and southern France. There is a record from northwestern Italy, but there is no recent confirmation of its occurrence in this country. It is present on the islands of Ons and Arousa in Galicia (Spain), Minorca (an old introduction) in the Balearic Islands (Spain), and Iles d'Hyères, France. The species ranges from sea level to 2,200 m asl.