单室茱萸属（学名：Mastixia）是山茱萸科下的一个属，为乔木植物。该属共有25种，分布于印度、马来西亚。

Mastixia is a genus of about 19 species of resinous evergreen trees, usually placed in the family Cornaceae. Its range extends from India through Southeast Asia and New Guinea to the Solomon Islands. Mastixia species have alternate or opposite simple broad leaves, many-flowered inflorescences, and blue to purple drupaceous fruits.