James Nyang Chiengjiek is a runner originally from South Sudan, but now living and training in Kenya. He was selected by the International Olympic Committee (IOC) to compete for the Refugee Olympic Team (ROT) at the 2016 Summer Olympics. He placed last in his 400 m heat. He was also qualified to the 2020 Tokyo Olympics ROT, and placed last in his 800 m heat after tripping due to a fellow competitor's involuntary touch.

The Refugee Olympic Team competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016, as independent Olympic participants.