狐尾藻属（学名：Myriophyllum）是小二仙草科下的一个属，为水生草本植物。该属共有约45种，分布于全球。

Myriophyllum (watermilfoil) is a genus of about 69 species of freshwater aquatic plants, with a cosmopolitan distribution. The center of diversity for Myriophyllum is Australia with 43 recognized species (37 endemic). Its name comes from Latinized Greek, "myrio" meaning "ten thousand", or figuratively "too many to count", and "phyllum" meaning "leaf".