Westlothiana is a genus of reptile-like amphibians or possibly early reptiles that bore a superficial resemblance to modern-day lizards. It lived about 335 million years ago during the latest part of the Visean age of the Carboniferous period. It is known from a single species, Westlothiana lizziae. The type specimen was discovered in East Kirkton Quarry, West Lothian, Scotland in 1984. Westlothiana's anatomy contained a mixture of both labyrinthodont and reptilian features, and was originally regarded as the first reptile. Most scientists place them among the Reptilomorpha, as a sister group to the first amniotes.