Brigid Jepchirchir Kosgei (born 20 February 1994)[1] is a Kenyan long-distance runner who specialises in the marathon.

[5][10] Kosgei later won the Chicago Marathon, after breaking away from a group of two other Kenyans and three Ethiopians after 30–35 kilometres (19–22 mi) of the race.

At the 2019 Great North Run, Kosgei won in a course-record time of 1:04.28, 23 seconds faster than the previous half marathon world record set by Joyciline Jepkosgei.

[16] She won the 2019 Chicago Marathon on 13 October 2019 in a world record time of 2:14:04, an improvement of her personal best by more than 4 minutes.

[2] Kosgei wore specially adapted Nike shoes, which have been alleged to have given her a 60–90 second advantage.

[21] In February 2020, Kosgei finished second to Yeshaneh at the Ras Al Khaimah Half Marathon.

[24] Before its postponement, Kosgei was chosen to lead the Kenyan women's marathon squad for the 2020 Summer Olympics in Tokyo, Japan.

[25][26] In February 2021, Kosgei was confirmed in the Kenyan marathon team for the rescheduled 2020 Summer Olympics, alongside Cheruiyot, Chepng'etich and Peres Jepchirchir.