San Juan Chamula is a municipio and township in the Mexican state of Chiapas. It is situated some 10 km from San Cristóbal de las Casas.
As of 2010, the municipality had a total population of 76,941. Virtually the entire population of the municipality is indigenous and speaks an indigenous language. In 2010, the census reported that 99.5% of the population age 3 years or older speaks an indigenous language. The Tzotzil people and language dominate the municipality.