The 2012 Boston Marathon took place in Boston, Massachusetts on Monday April 16, 2012. It was the 116th edition of the mass-participation marathon. Organized by the Boston Athletic Association, it was the first of the World Marathon Majors series to be held in 2012. A total of 22,426 runners started the race. The competition was held in hot running conditions, reaching 88 °F (31 °C) that afternoon, and some of the 27,000 registered runners opted to take up the organizers' offer to defer their entry until the 2013 race.

Sharon Jemutai Cherop is a Kenyan long-distance runner who specialises in the marathon. She won a bronze medal at the age of sixteen in the 5000 metres at the World Junior Championships. She was the bronze medal winner in the marathon at the 2011 World Championships in Athletics and won the Boston Marathon in 2012.