Kalu (Amharic: ቃሉ) also known as Harbu is one of the woredas in the Amhara Region of Ethiopia. Part of the Debub Wollo Zone, Kalu is bordered on the west by Dessie Zuria, on the north by Were Babu, on the south and east by the Oromia Zone, on the southeast by Argobba special woreda, and on the southwest by Abuko. The administrative center for this woreda is Harbu; other towns in Kalu include Ancharo, Gerba, and Degan. A highway linking Kombolcha and Afar bisects Kalu to two parts.