The world’s oldest marathon competition is the Boston Marathon.
The B.A.A. has organized the Boston Marathon since the event’s inception in on April 19th, 1897 (little known tidbit– one year after the first modern Olympics debuted in 1896). The Boston Marathon is the world’s oldest annual marathon and ranks as one of the world’s most prestigious road racing events. (baa.org)
The Boston Marathon is an annual marathon race hosted by several cities and towns in greater Boston in eastern Massachusetts, United States. It is traditionally held on Patriots’ Day, the third Monday of April.