Joyciline Jepkosgei (born 8 December 1993) is a Kenyan female long-distance runner who competes over distances from 10,000 metres to the marathon.
She is the current half marathon world record holder in contests with mixed-gender fields with her personal best of 64:51 minutes, and additionally the record holder in the 10 km with 29:43 minutes.
She was a bronze medallist over 10,000 m at the African Championships in Athletics in 2016.
Jepkosgei ran a pending world record for the half marathon of 1:04:52 at the Sportisimo Prague Half Marathon in April 2017, becoming the first woman ever to break 65 minutes.
She also unofficially broke the IAAF-ratified records for 10 km, 15 km and 20 km along the way, breaking a total of four world records in a single event.
She also became the first Kenyan ever to break six world records in six months.