The 2014 Boston Marathon took place in Boston, Massachusetts, on Monday, April 21. It was the 118th official running of the Boston Marathon, traditionally held on Patriots' Day. The race is organized by the Boston Athletic Association, and has been happening yearly since 1897. On account of the 2013 Boston Marathon bombings, extra security measures were implemented. They started a safety committee which began meeting in January of each year, as well as had a multi-agency coordination center to provide a place for people to go who were in need of help during the course of the race. New laws included the Post Disaster Mental Health Act were implemented which provides mental health services for places after a disaster even if it is not considered extreme enough to be a Major Disaster. The 2014 Marathon had about 36,000 registered participants, second only to the 1996 race in number of entries.

Mebrahtom "Meb" Keflezighi (; is a retired American long distance runner. He is the 2004 Olympic silver medalist in the marathon and finished in fourth place in the 2012 Summer Olympics. He won the 2009 New York City Marathon on November 1, 2009, and the 2014 Boston Marathon on April 21, 2014, becoming the first American man to win each race since 1982 and 1983, respectively. Keflezighi is a graduate of UCLA, where he won four NCAA championships competing for the UCLA Bruins track and field team. He came in fourth in the 2014 New York City Marathon on November 2, 2014, eighth in the 2015 Boston Marathon on April 20, 2015, and second in the 2016 U.S. Olympic Team Trials to qualify for the 2016 Summer Olympics.