Jimma Arjo is one of the woredas in the Oromia Region of Ethiopia. It shares the name of one of the subgroups of the Oromo people, the Jimma Arjo. Part of the Misraq Welega Zone, Jimma Arjo is bordered on the southwest by the Didessa River which separates it from the Illubabor Zone, on the northwest by Diga Leka, on the northeast by Guto Wayu, and on the southeast by Nunu Kumba.