Kathu (alternatively Kasu or Gasu; autonym: [kᴀ̰33 θṵ31]) is an SOV Lolo-Burmese language spoken in Balong Village (坝聋村), Nanping Township
(南屏镇), Guangnan County, Yunnan, China. It has 4 tones, /55/, /33/, /31/, /13/. The subscript tildes signify tenseness, and the apostrophes signify aspiration.
According to Chen (2003), this language is spoken by the Flowery Luo (花倮) people of Anwang Village (安王村), Nanping Township (南屏镇), Guangnan County, Yunnan, China. It might be a identical or similar to Kathu as reported in Wu Zili (1994).