龙牙草属（学名：Agrimonia）是蔷薇科下的一个属，为多年生草本植物。该属共有约10种，分布于北温带。

Agrimonia (from the Greek ἀργεμώνη), commonly known as agrimony, is a genus of 12–15 species of perennial herbaceous flowering plants in the family Rosaceae, native to the temperate regions of the Northern Hemisphere, with one species also in Africa. The species grow to between .5–2 m (1.6–6.6 ft) tall, with interrupted pinnate leaves, and tiny yellow flowers borne on a single (usually unbranched) spike.