The Quems were an Indigenous people who lived along the Rio Grande in what is now the U.S. state of Texas and the Mexican state of Coahuila in the 17th and 18th centuries. They are known to have settled around present-day Eagle Pass and Piedras Negras. Damián Massanet also recorded them, in 1691, as one of six groups of Indians encountered along a stream called "Caramanchel"; this appears to correspond with today's Comanche Creek in the southwestern part of Zavala County. Massenet implied that all six groups spoke a language now known as Coahuilteco.