CMAC was formed in 2002 by the six original member schools (Prem, GIS, CMIS, NIS, LIST, APIS). It was formed in response to the international schools in Chiang Mai wanting to have some organized games. However, the athletic directors (AD's) of the international schools wanted to take it that to the next level. As such we founded CMAC, with a set constitution and a full calendar for sports. With CDSC admitted as a member in 2005 and UCIS admitted a provisional member in 2018 and a full member in 2021. The conference has continued to grow with two new provisional members admitted in 2021, ACIS and VCIS. Our new 10 member CMAC group is ready to go in 2021. The calendar sees season games, tournaments and meets in a wide range of sports for our youngest athletes all the way up to the Varsity level.

The mission of CMAC is to teach and instruct students in the rules, fundamentals and skills of various individual and team sports; to provide physical training and a physical outlet for adolescent energy; and to provide healthy competition and cooperation within and between schools, thus instilling in each student the best principles of good sportsmanship.