金刚大属（学名：Croomia）是百部科下的一个属，为多年生直立草本植物。该属共有3种，分布于美国东南部和东亚。

Croomia is a genus of primitive angiosperm herbs in the Stemonaceae Family described as a genus in 1840.

Croomia is native to China, Japan, and the southeastern United States. The plants grow in moist shady woods. Their small flowers are borne under the leaves.