The American School Foundation (ASF) is an independent coeducational College-preparatory school for international students aged 3 to 18, located in Mexico City. Founded in 1888, it is the oldest operating accredited American School outside the United States. As of 2019, over 2,400 students from more than 40 countries attend the school's Bondojito campus. English is the language of instruction with the exception of a fully bilingual program in the Lower School and courses in Spanish at the secondary level. The school currently hires about 250 international faculty.