帽柱木属（学名：Mitragyna）是茜草科下的一个属，为灌木或乔木植物。该属共有约10种，分布于热带亚洲和非洲。

Mitragyna is a genus of trees in the Rubiaceae family. Members of this genus contain antimalarial and analgesic indole alkaloids. Species of this genus include Mitragyna ciliata, Mitragyna ledermannii, Mitragyna parvifolia, Mitragyna speciosa, Mitragyna stipulosa, Mitragyna javanica and Mitragyna inermis. The Rubiacae is the fifth largest family of flowering plants by number of genera, and the fourth or fifth largest by number of species.