"Chui River" and "Chuy River" redirect here. For the river of Anhui see Chu River (Anhui). For the South American Chuí or Chuy River, on the Brazil-Uruguay border and Brazil's southernmost point, see Chuí Stream. For the Nam Sam River or Chu River, on the Lao-Vietnam border, see Nam Sam River.

The Chuí, or Chuy Stream (Brazilian Portuguese: Arroio Chuí , Rioplatense Spanish: Arroyo Chuy or ), is a short stream on the Brazilian–Uruguayan border that is celebrated as Brazil's southernmost point.