Mary Jepkosgei Keitany (born 18 January 1982) is a Kenyan runner who specialises in long distance running up to the marathon distance. She won silver at the 2007 IAAF World Road Running Championships and became the World Half Marathon champion two years later. She won the 2012 London Marathon with a personal best of 2:18:37 hours – making her the second fastest woman ever in the event. In 2017, she set the women-only women's world record in 2017 London Marathon with a time of 2:17:01.
Her personal best of 1:05:50 in the half marathon is the former women's world record. She also held the world record in the women's 10 miles (50:05 minutes), 20 km (62:36), and the 25 km (1:19:53).