Wamasaba (kwa Kimasaba: Bamasaaba) ni kabila la Kibantu linaloishi mashariki mwa Uganda, katika wilaya za Sironko, Manafwa, Bududa, Mbale na Bulambuli. Wanahusiana sana na Wabukusu na Waluhya wa Kenya magharibi. Wanakadiriwa kuwa 2,700,000. Wengi wao ni wakulima wanaozalisha hasa mtama, mahindi na ndizi. The current Babukusu of western Kenya are believed to have migrated from the Bamasaaba, particularly from areas around Bubulo, in current Manafwa District. Many clans among the Babukusu have their origins among the Bamasaaba, a testimony to this linkage. Masinde Muliro, once a veteran politician and elder of the Babukusu from Kitale, was from the Bakokho clan, with its base at Sirilwa, near Bumbo in Uganda. Other clans common to both sides include Batiiru Babambo, Baata, Bakitang'a and Batiiru. There are other clans whose names, however, that are only on one side, such as Babichache and Balonja who are mainly among the Babukusu. The common cultural ties are a further indication of close relations among the two sister ethnic groups.