水茴草属（学名：Samolus）是报春花科下的一个属，为一年生或多年生草本植物。该属共有10种，分布于全球。

Samolus (known as brookweed, or water pimpernel) is a widely distributed genus of about a dozen species of water-loving herbs. According to the APG III classification, this genus belongs to the Primulaceae family in the order Ericales. It was considered as closely related to a clade comprising the Theophrastaceae, and was treated as part of that family or in its own monogeneric family, the Samolaceae. The APG III system does not recognize these families and instead includes all species formerly belonging to Theophrastaceae in the Primulaceae family.