Nelly Chepchirchir (born 4 June 2003) is a Kenyan track and field athlete.

[1] Chepchirchir competed at the 2022 World Athletics U20 Championships in Cali, Colonbia and qualified for the final of the 800 metres.

[5] She then won the Gyulai Istvan Memorial, World Athletics Continental Tour Gold, in Szekesfehervar, Hungary in July 2023 running 4:00.18.

[6] Selected for the 2023 World Athletics Championships, she won her heat and her semi-final in the 1500m to qualify for the final.

[9] She competed in the 1500 metres at the 2024 Summer Olympics in Paris in August 2024, reaching the semi finals.