Joseph Nguen Monytuil is the Governor of Unity State, South Sudan, a post he has held since July 7th, 2013 to 20th May 2024 when he was relieved and replaced by the president of South Sudan Salva Kiir Mayardit with Riek Bim Top. On March 23, 2026 Monytuil was reappointed as the governor of Unity state.
Monytuil was the first governor of Northern Liech State, which was created by Salva Kiir on 2 October 2015. Before his appointment as the governor of Northern Liech, he was the caretaker governor of the former Unity State deputized by Colonel Miabek Lang Miading Bil-Kuei from Panriang who was later replaced with the current deputy governor James Tor Tunggur Kueiguong from SPLM-IO party. Joseph's predecessor is the current vice president for infrastructure Cluster of the Republic of South Sudan, Gen. Taban Deng Gai.