Joyciline Jepkosgei (born 8 December 1993)[1] is a Kenyan female long-distance runner who competes over distances from 10,000 metres to the marathon.

[5] She knocked her best down to 1:09:09 minutes at the following year's First Lady's Half Marathon in the Kenyan capital, placing second to Valentine Kipketer.

[9] Jepkosgei ended her breakthrough year with a runner-up finish at the Prague Grand Prix and a win at the Marseille-Cassis Classique Internationale.

The winner, Peres Jepchirchir, broke the world record and Jepkosgei ran the fastest ever time for her placing, as did runner-up Mary Keitany.

In September 2017, with the aid of a male pacer, she further improved her own 10K world record to 29:43,[13] just ahead of Fancy Chemutai (30:06), and Violah Jepchumba (30:25), at the Prague Grand Prix, thus becoming the first woman ever to run the distance under 30 minutes.