滑体亚纲（英文：Lissamphibia），是两栖动物中唯一一群存活至今的动物，包括无足目的蚓螈、有尾目的蝾螈和无尾目的青蛙与蟾蜍。 虽然目之间的分类关系尚不清楚，但皆具有共同的特征，可以揭示皆从一同共组演化而来，形成一个演化支(clade)。

The Lissamphibia are a group of tetrapods that includes all modern amphibians. Lissamphibians consist of three living groups: the Salientia (frogs, toads, and their extinct relatives), the Caudata (salamanders, newts, and their extinct relatives), and the Gymnophiona (the limbless caecilians and their extinct relatives). A fourth group, the Allocaudata, was moderately successful, spanning 160 million years from the Middle Jurassic to the Early Pliocene, but became extinct 2.5 million years ago.