The Boston Marathon is an annual marathon hosted by the U.S. city of Boston, Massachusetts, on Patriots' Day, the third Monday of April. Begun in 1897, inspired by the success of the first modern-day marathon competition in the 1896 Summer Olympics,^[1] the Boston Marathon is the world's oldest annual marathon, and ranks as one of the world's best-known road racing events. It is one of five World Marathon Majors.

Today, the Boston Athletic Association (B.A.A.) manages this event. Amateur and professional runners from all over the world compete in the Boston Marathon each year, braving the hilly New England terrain and varying weather to take part in the race.