乌桕属（学名：Sapium）是大戟科下的一个属，共有约125种，为灌木或乔木的开花植物。该属分布于热带地区，特别是新热带界。传统上，该属的植物主要为肥皂及牛脂的生产而种植。

下列品种原来被归纳为乌桕属，现已重新分类：

Sapium is a genus of flowering plants in the family Euphorbiaceae. It is widespread across most of Latin America and the West Indies. Many Old World species were formerly included in the genus, but recent authors have redistributed all the Old World species into other genera.