Alpha Phi Omega (
ΑΦΩ) (commonly known as
APO, but also
A-Phi-O and
A-Phi-Q) is the largest collegiate
fraternity in the
United States, with chapters at over 350 campuses, an active membership of over 25,000 students, and over 400,000 alumni members. There are also 250 chapters in the
Philippines and one in
Australia.