The Sierra Juárez is a range of mountains in Oaxaca state, Mexico between latitudes 17°20'-17°50'N and longitudes 96°15'-97°00'W, with an area of about 1,700 km².
It is part of the Sierra Madre de Oaxaca.
The range is separated from the Sierra de Zongólica to the north by the Santo Domingo River, flowing through the Tecomavaca Canyon. It stretches south-eastward to the Cajones River and the Sierra de Villa Alta.
The mountains are in the district of Ixtlán de Juárez in the Sierra Norte de Oaxaca region.
The range is named after Mexico's only indigenous president, Benito Juárez, who was born here in 1806 in the small village of San Pablo Guelatao.
The heavily wooded area is about 62 km from the city of Oaxaca on Federal highway 175, heading towards Tuxtepec.