Acacia koa, commonly known as koa, is a species of flowering tree in the family Fabaceae.

A disease of the koa tree caused by Fusarium oxysporum fungi, which clog the xylem and cause wilting.

King-to Nin Jiom Pei Pa Koa, commonly known as Nin Jiom Pei Pa Koa or simply Nin Jiom Herbal Cough Syrup, is a traditional Chinese natural herbal remedy used for the relief of sore throat, coughs, hoarseness and aphonia.