枝角目（学名：Cladocera）是甲壳亚门之下的一个目，由细小的水蚤生物，合共约620个已辨识的物种。本目原为鳃足纲叶足亚纲双甲目（Diplostraca）之下的一个亚目，随着双甲目获提升成为双甲下纲，枝角亚目亦提升成为枝角目。

尽管现时本目之下有近千个已辨识的物种，由于其体积细小，至今仍有不少物种未为辨识。这些生物在内陆的水体很常见，但罕见于海洋。其体积长约0.2～6.0 mm，有一个往下的头，及一幅几乎把没有节的喉部及腹部覆盖的头胸甲。有一颗置中的复眼。

The Cladocera are an order of small crustaceans commonly called water fleas. Around 620 species have been recognised so far, with many more undescribed. They are ubiquitous in inland aquatic habitats, but rare in the oceans. Most are 0.2–6.0 mm (0.01–0.24 in) long, with a down-turned head with a single median compound eye, and a carapace covering the apparently unsegmented thorax and abdomen. Most species show cyclical parthenogenesis, where ****ual reproduction is occasionally supplemented by sexual reproduction, which produces resting eggs that allow the species to survive harsh conditions and disperse to distant habitats.