This study examined the relationship between workforce diversity and corporate performance of Multinational Corporations in Rivers State, Nigeria. The objectives of the study were to examine the relationship between dimensions of workforce diversity such as gender, age, and cultural diversity and measures of corporate performance such as customer retention, profitability, and market share. Qualitative research paradigm was adopted so the study relied mainly on review of related literature and content analysis. It was found that workforce diversity enhances corporate performance of Multinational Corporations in Rivers State, Nigeria if properly managed. The implication of this finding is that multinational firms in Rivers State will not perform optimally in terms of customer retention, high profit and market share expansion till they are able to harness the potentials of workforce diversity. Therefore, the study recommended among others that Multinational corporations should employ and give equal opportunity and treatment to both men and women to enable them bring out their uniqueness; also, multinational firms should not limit their employment to indigenes of their immediate host community rather, they should give room for people from different tribes, linguistic background and religion by harmonizing their views selectively.