有鳞目（学名：Squamata）是现今爬虫纲中最大的目，包括蜥蜴、蛇和蚓蜥。

传统上，有鳞目分为三个亚目：

由于蛇与蚓蜥是从蜥蜴演化而来，蜥蜴被视为是并系群。在较新的分类法中，有鳞目被分为以下亚目，但彼此的演化关系尚未定论：

The order Squamata, or the scaled reptiles, are the largest recent order of reptiles, comprising all lizards and snakes. With over 9,000 species, it is also the second-largest order of vertebrates, after the perciform fish. Members of the order are distinguished by their skins, which bear horny scales or shields. They also possess movable quadrate bones, making it possible to move the upper jaw relative to the neurocranium. This is particularly visible in snakes, which are able to open their mouths very wide to accommodate comparatively large prey. They are the most variably sized order of reptiles, ranging from the 16 mm (0.63 in) dwarf gecko (Sphaerodactylus ariasae) to the 5.21 m (17.1 ft) green anaconda (Eunectes murinus) and the now-extinct mosasaurs, which reached lengths of 14 m (46 ft).