单性木兰属（学名：Kmeria）是木兰科下的一个属，为常绿乔木植物。该属共有2种，分布于东亚。

Kmeria is a genus of tree in the family Magnoliaceae, consisting of 5 species, native to eastern Asia in southern China and Indochina. The species Kmeria duperreana is known for yielding kmeriol.

The genus was previously included in Magnolia, from which it was separated on the basis of its unisexual flowers and ventral mode of dehiscence. It is not accepted in the draft Magnoliaceae account in the Flora of China, where the species are divided between the genera Woonyongia (K. septentrionalis) and Parakmeria (the others).