The Amateur Athletic Union (AAU) is an amateur sports organization based in the United States. A multi-sport organization, the AAU is dedicated exclusively to the promotion and development of amateur sports and physical fitness programs. It has more than 700,000 members nationwide, including more than 100,000 volunteers. The philosophy of the AAU is "Sports for All, Forever."

William Buckingham "Father Bill" Curtis was one of the most important proponents of organized athletics in the late 1800s in America. Curtis had a remarkable career as a competitor, official, sports editor, organizer, and administrator. He was known as "Father Bill" in the athletic world. The death of Curtis at the age of 63 while climbing Mount Washington brought forth an outpouring of testimonials from the sports world and recognition as a "father of American amateur athletics".