Rukai is a Formosan language spoken by the Rukai people in Taiwan. It is a member of the Austronesian language family. The Rukai language comprises six dialects, which are Budai, Labuan, Maga, Mantauran, Tanan, and Tona. The number of speakers of the six Rukai dialects is estimated to be about 10,000. Some of them are monolingual. There are varying degrees of mutual intelligibility among the Rukai dialects. Rukai is notable for its distinct grammatical voice system among the Formosan languages.