Mary Jepkosgei Keitany (born 18 January 1982) is a Kenyan former professional long distance runner.

In August 2018, she was honored by the Shoe4Africa foundation who funded and built the Mary Keitany Shoe4Africa school in Torokwonin, Baringo County, Kenya.

She won a second gold medal as part of the winning Kenyan squad in the team competition.

[13] Keitany began the year in record-breaking form as she won the Ras Al Khaimah Half Marathon with a world record time of 1:05:50 hours.

[16] She was the pre-race favourite for the New York City Marathon, where she built a significant lead by the halfway point (running at more than four minutes faster than the course record).

She slowed dramatically, however, in the second half of the race and was overtaken by Firehiwot Dado and Buzunesh Deba, leaving her in third place with a finishing time of 2:23:38 hours.

[17] She intended to improve her world record mark at the Ras Al Khaimah Half Marathon, but windy conditions slowed her to a finish time of 1:06:49 hours.

[18] At the London Marathon, she broke Catherine Ndereba's African record with a winning time of 2:18:37 hours and became the third fastest woman ever at this distance.

[19] At the Summer Olympics in London, she ran a fast pace among the lead pack until the 41 kilometre mark, where she fell behind to finish fourth.

[21] On 2 November, Keitany battled with eventual second-place finisher Jemima Sumgong to win the New York City Marathon in a time of 2:25:07.

[22] At the London Marathon, Keitany was one of the "Fantastic Four" of Kenyans (consisting of Keitany, Edna Kiplagat, Florence Kiplagat, and Priscah Jeptoo) who were expected to win the race and possibly challenge Paula Radcliffe's course record (and women's world record).

Keitany won the 2016 Bix 7 Road Race in Davenport, Iowa in 35:18 and set the course record for women.

The third, fourth, and fifth-place finishers (Joyciline Jepkosgei, Jemima Sumgong, and Tirunesh Dibaba) also set new personal bests.

[35] Her retirement was occasioned by a hip injury she suffered during the 2019 London marathon, which restricted her training and performance.