Carmen Frei Ruiz–Tagle (born June 22, 1938) is a Chilean politician and teacher. She served as Senator from 1990 to 2006.
Frei was born in Santiago, the eldest child to Eduardo Frei Montalva and María Ruiz-Tagle. She studied at the Colegio Universitario Inglés; and later graduated as a teacher (specializing in infants) from the Universidad de Chile. She became a councilwoman for Santiago in 1970, and was elected Senator for Antofagasta in 1990, being reelected in 1998. She lost the position in 2006. She was married to Eugenio Ortega and has 3 children.