Deder (Oromo: Aanaa Dadar), is one of the Districts in the Oromia Region of Ethiopia. It is named after the administrative center, Deder. Part of the East Hararghe Zone, Deder is bordered on the south by Malka Balo, on the west by the West Hararghe Zone, on the north by Goro Gutu, on the east by Meta, and on the southeast by Bedeno. Towns in the district include Kobo, deder, Soqaa.