Established in 1887, the Boston Athletic Association is a non-profit organization with a mission of promoting a healthy lifestyle through sports, especially running.

The Boston Athletic Association (B.A.A.) has organized the Boston Marathon® since the event’s inception in 1897.The Boston Marathon is the world's oldest annual marathon and ranks as one of the world's most prestigious road racing events. The B.A.A. continues to manage this American classic, which has been sponsored by John Hancock Financial Services since 1986. The Boston Marathon has distinguished itself as the pinnacle event within the sport of road racing by virtue of its traditions, longevity, and method of gaining entry into the race (via qualification).

More than 125 years after its inception, the Boston Athletic Association continues to be a leader within the sport of road racing and annually carries on the tradition of the Boston Marathon. The B.A.A. promotes a healthy lifestyle through the support of comprehensive charity, youth, and year-round running programs.