For 15 years, the Asia-Pacific Special Interest Group (APSIG) has been dedicated to supporting the education and training of radiotherapy staff in Asia-Pacific low- and middle-income countries. The introduction of new and complex treatment techniques using modern radiotherapy equipment into Asia-Pacific hospitals can be challenging, and APSIG support staff, with volunteers who are certified ACPSEM Medical Physicists, can provide in-country training as well as continuing remote support to ensure the safe delivery of effective radiotherapy for patients.