闭鞘姜属（学名：Costus）是姜科下的一个属，为多年生草本植物。该属共有约150种，主要分布于热带美洲和非洲。

See Catherine of Alexandria for the man named Costus often held to be her father.

Costus is a group of perennial herbaceous plants in the family (Costaceae) described by Linnaeus as a genus in 1753. It is widespread through tropical and subtropical regions of Asia, Africa, and the Americas.

Costus is often characterized and distinguished from relatives such as Zingiber (true ginger) by its spiraling stems. The genus as a whole is thus often called spiral gingers, but this can also refer to C. barbatus specifically.