Welcome to APO! Alpha Phi Omega (APO) is a co-ed service fraternity organized to provide community service, leadership development, and social opportunities to college students. Alpha Phi Omega is the largest fraternity on college campuses in the United States, but also has chapters around the world, including Australia and the Philippines. APO's primary focus is to provide volunteer service within four areas: service to the community, service to the campus, service to the fraternity, and service to the nation as participating citizens. Leadership, Fellowship, and service are the key components of the fraternity.