The Anglo-Chinese School Old Boys’ Association (ACSOBA) is the oldest formally incorporated alumni association in Singapore and is traditionally a self-funding voluntary organisation run by faithful ACSians who rally together to work for the betterment of their alma mater. The ACSOBA regularly provides a platform for personal contact and organises numerous activities for its members.

The ACS spirit and the unshakable bonds that ACSians have with the School and each other are the fruit of years of camaraderie. As a result, alumni have a unique sense of loyalty and gratitude to their alma mater.