Gedeb Hassasa is one of the Aanaas in the Oromia of Ethiopia. Part of the West Arsi Zone, Gedeb Hassasa is bordered on the south by the Dodola, on the west by Kofele, on the north west by Kore, and on the north and east by Bekoji. The administrative center of the woreda is Hassasa.
Ulrich Braukämper theorizes that the name "Gedeb" comes from a Hadiya subgroup mentioned in the Royal Chronicle of Zara Yaqob, where they are referred to as the "Gab". Braukämper has argued that the Hadiya kingdom prior to the Great Oromo migration in the 16th century included in this area, presenting a number of facts supporting his argument, as opposed to other experts who argue that it extended to the east.[1]