1866 in sports

1866 in sports describes the year's events in world sport. Association football Events Foundation of Upton Park F.C. Athletics Events The Amateur Athletics Club (AAC) is founded and becomes the governing body of athletics in the United Kingdom, hosting the first national championships and introducing a definition of "amateur" that will determine eligibility for athletics competitions until the late 20th century. Baseball National championship National Association of Base Ball Players champion – Brooklyn Atlantics Events National Association membership triples and geographic scope explodes, from Fort Leavenworth, Kansas to Portland, Maine. The association hears cases of professionalism at the center and there is no longer a clear and official NABBP champion.