The first Nigerian leader to become chairman of the Organization of African Unity was

The answer to the question is Yakubu Gowon. He became the chairman of the Organization of African Unity (OAU) in 1975, during his tenure as the military head of state in Nigeria. The OAU was the predecessor of the current African Union (AU) and was established to promote unity and cooperation among African countries. Gowon's chairmanship of the OAU was significant because it gave Nigeria a prominent voice in African affairs and helped to enhance its standing as a leader on the continent.