The 2021 Boston Marathon was the 125th running of the annual marathon race held in Boston, Massachusetts. It took place on October 11, 2021. The elite men's marathon was won by Benson Kipruto and the elite women's marathon by Diana Kipyokei, both of Kenya, in 2:09:51 and 2:24:45, respectively. The men's wheelchair race was won by Marcel Hug and the women's wheelchair race by Manuela Schär, both of Switzerland, in 1:18:11 and 1:35:21, respectively. In October 2022, Kipyokei was stripped of her title after she tested positive for triamcinolone acetonide.