Comprehensive High School, Aiyetoro (CHSA)is a co-educational American style High school situated 37 kilometers west of Abeokuta in Ogun State.

The school was founded in February 1963 jointly by the United States Agency for International Development(USAID), Harvard University, the Ford Foundation and the defunct Western region government. The school pioneered the 6-3-3-4 system and authentic comprehensive education in Nigeria. Fondly known as COMPRO, the school has produced many distinguished old students.