艾草、艾叶或艾（学名：Artemisia argyi），是一种多年生草本植物，分布于亚洲及欧洲地区。

多年生草本，揉之有香气；叶子羽状分裂，背面有白丝绒毛；秋季开花，头状花序小而多，排成狭长总状花丛。

Mugwort is a common name for several species of aromatic plants in the genus Artemisia. In Europe, mugwort most often refers to the species Artemisia vulgaris, or common mugwort. While other species are sometimes referred to by more specific common names, they may be called simply "mugwort" in many contexts. For example, one species, Artemisia argyi, is often called "mugwort" in the context of Traditional Chinese Medicine but may be also referred to by the more specific name "Chinese mugwort". Artemisia princeps is the Japanese mugwort, also known as yomogi (ヨモギ).