Illubabor is one of the zones of the Oromia Region of Ethiopia. Illubabor is named for the former province Illubabor. It is bordered on the south by the Southern Nations, Nationalities and Peoples Region, on the southwest by the Gambela Region, on the west by Kelem Welega Zone, on the north by Mirab Welega Zone, and Benishangul-Gumuz Region, on the northwest by Misraq Welega Zone, and on the east by Jimma.