Kui (Chinese: 夔; pinyin: kuí; Wade–Giles: k'uei) is a polysemous figure in ancient Chinese mythology. Classic texts use this name for the legendary musician Kui who invented music and dancing; for the one-legged mountain demon or rain-god Kui variously said to resemble a Chinese dragon, a drum, or a monkey with a human face; and for the Kuiniu wild yak or buffalo.
While Kui 夔 originally named a mythic being, Modern Standard Chinese uses it in several other expressions. The reduplication kuikui 夔夔 means "awe-struck; fearful; grave" (see the Shujing below). The compounds kuilong 夔龍 (with "dragon") and kuiwen 夔紋 (with "pattern; design") name common motifs on Zhou Dynasty Chinese bronzes. The chengyu idiom yikuiyizu 一夔已足 (lit. one Kui already enough") means "one able person is enough for the job".
Kui is also a proper name. It is an uncommon one of the Hundred Family Surnames. Kuiguo 夔國 was a Warring States period state, located in present-day Zigui County (Hubei), that Chu annexed in 634 BCE. Kuizhou 夔州, located in present-day Fengjie County of Chongqing (Sichuan), was established in 619 CE as a Tang Dynasty prefecture.