Nelly Jepkosgei (born 14 July 1991) is a Kenyan-born female middle-distance runner who specialises in the 800 metres. She originally competed for Kenya, running at the 2010 World Junior Championships in Athletics and the 2011 All-Africa Games, but now competes for Bahrain. A dispute between the national bodies resulted in Jepkosgei being ineligible to run for Bahrain until March 2021, and she failed to represent her nation of birth at the 2019 African Games, despite being selected. She holds personal bests of 1:58.96 minutes for the 800 m and 4:00.99 minutes for the 1500 metres. She also holds the Kenyan national record for the 1000 metres with her time of 2:35.30 minutes.