多穗兰属（学名：Polystachya）是兰科下的一个属，为附生兰。该属共有约210种，分布于热带。

Polystachya, abbreviated Pol in horticultural trade, and commonly known as yellowspike orchid, is a flowering plant genus in the orchid family (Orchidaceae). This rather distinctive genus was described by William Jackson Hooker in 1824 and is the type genus of the subtribe Polystachyinae. It contains about 100 species widespread across much of the tropical parts of the globe.