The Sui language (simplified Chinese: 水语; traditional Chinese: 水語; pinyin: shuǐ yǔ) is a Tai–Kadai language spoken by the Sui people of Guizhou province in China. According to Ethnologue, it was spoken by around 200,000 people in 1999. Sui is also unique for its rich inventory of consonants, with the Sandong (三洞) dialect having as many as 70 consonants.