Deder is one of the woredas in the Oromia Region of Ethiopia. It is named after the administrative center, Deder. Part of the Misraq (East) Hararghe Zone, Deder is bordered on the south by Malka Balo, on the west by the Mirab (West) Hararghe Zone, on the north by Goro Gutu, on the east by Meta, and on the southeast by Bedeno.