Abstract
This study evaluates Nigeria's role within the African Union (AU) during President Muhammadu Buhari's tenure, spanning from 2015 to 2023. The objectives of the study are to examine the role of Nigeria in the formation of the African Union in 1963; and to examine the extent to which Nigeria contributed to the agenda of the African Union under Buhari’s administration. The investigation employs a research design of a qualitative nature. The analysis of the interviews and documents was conducted through tabular analysis, whereby the identification of themes for the interviews conducted with the stakeholders was carried out to accomplish the objectives of the investigation. The study reveals that Nigeria made significant contributions to the implementation of the African Union's agenda during President Buhari's administration from 2015 to 2023 and achieved noteworthy accomplishments within the organization's framework. This indicates Nigeria's commitment and dedication to advancing the goals and objectives of the OAU/A U demonstrating that, despite the numerous internal challenges faced by Nigeria, it effectively participated in and contributed to the efforts of the African Union. The study strongly recommends that Nigeria should cooperate with AU member countries to coordinate efforts in the battle against Boko Haram. The government should prioritize the implementation and enforcement of transparent and accountable governance practices to effectively combat corruption at all levels.