A crucial issue with board diversity is corporate governance and corporate law. This study looked at multi-dimensionality, theoretical foundations, and the connection between corporate success and diversity. Proponents claim that diversity increases a company's value, although detractors disagree to this. The doctrinal research involved the use of the various legal provisions in Nigeria (Companies and Allied Matters Act 2020, Nigerian Code of Corporate Governance 2018, 1999 Constitution of Nigeria and court judgements) and secondary literature. Results show that there is improvement in the level of independence of boards, but that there are still some areas of weakness in terms of gender and demographic diversity. The paper suggests legislative changes that will ensure gender diversity in companies, make the implementation more robust and create cultural changes towards inclusiveness to boost corporate performance and sustainable governance in Nigeria.