木豆（学名：Cajanus cajan）为豆科木豆属下的一个种，又称树豆，阿美语称Fata'an。原住民的主要粮食，阿美族人将这种树豆视为吉祥物。

The pigeonpea (Cajanus cajan) is a perennial legume from the family Fabaceae. Since its domestication in India at least 3,500 years ago, its seeds have become a common food grain in Asia, Africa, and Latin America. It is consumed in a large scale mainly in south Asia and is a major source of protein for the population of that subcontinent.