Yayu is one of the woredas in the Oromia Region of Ethiopia. Part of the Illubabor Zone, Yayu is bordered on the south by the Southern Nations, Nationalities and Peoples Region, on the west by Metu, on the north by Supena Sodo, on the east by Chora, and on the southeast by the Jimma Zone. Towns in Yayu include Elemo and Yayu. Doreni and Hurumu woredas were part of Yayu woreda.
Coffee is an important cash crop in Yayu; over 50 square kilometers are planted with this crop. The largest share of the proposed Yayu Biosphere Reservation, a project of the Ethiopian Coffee Forest Forum, lies in this woreda.