The Quarai were a Tiguex (Southern Tiwa) Pueblo band of American Indians that originated in present-day New Mexico. Because of Apache hostilities they fled to El Paso in around 1675; later they moved to Isleta del Sur on the Rio Grande.

Quarai is a Brazilian municipality located near the border with Uruguay on the Rio Quaraí. The population is 23,579 (2015 est.) in an area of 3,147.63 km², making it one of the largest municipalities in the state. Its elevation is 112 m. It is located 590 km west of the state capital of Porto Alegre, northeast of Montevideo, Uruguay and southeast of Alegrete.