This study examines the impact of British colonial rule on the traditional administration of Ogbomoso between 1893 and 1960. Before colonial intervention, Ogbomoso operated under a well-established indigenous political system headed by the Baale (later Soun), supported by traditional chiefs and community institutions that regulated political, judicial, and administrative affairs. The introduction of British colonial rule brought significant transformations through the implementation of indirect rule, native authority structures, and colonial administrative policies. These reforms altered existing power relations, redefined the authority of traditional rulers, and introduced new mechanisms of governance that gradually integrated Ogbomoso into the wider colonial administrative framework of Nigeria. The study utilizes both primary and secondary sources, including archival documents, government records, books, and scholarly journal articles, to investigate the nature of colonial administration and its effects on local governance. Findings reveal that colonial policies strengthened the authority of the Baale in some respects while simultaneously subjecting traditional institutions to colonial supervision and control. The research further demonstrates that the emergence of educated elites, progressive unions, and political associations contributed to the democratization of local administration and challenged the concentration of power within traditional structures. The study concludes that British colonial rule profoundly reshaped Ogbomoso's traditional administration, leaving enduring political and administrative legacies that continued to influence local governance beyond Nigeria's independence in 1960. The paper contributes to a broader understanding of the interaction between colonial governance and indigenous political institutions in southwestern Nigeria.