The purpose of this study was to investigate the workforce diversity and its benefits, challenges and the required managerial tools for improved staff productivity in secondary schools in Rivers State. Three research questions and hypotheses guided the study. The descriptive survey design was adopted and the stratified random sampling technique used in selecting the study sample of 132 principals from the population of 400, who responded to a structured questionnaire, tagged: Teaching Staff Diversity Management in the Workplace Questionnaire (TSDMWPQ). The questionnaire items were properly validated by experts in the departments of educational management and measurement and evaluation respectively. The reliability index stood at 0.96. In analysing the data, mean scores and standard deviation were used to answer the research questions, while z-test was used in testing the hypotheses at 0.05 level of significance. Major findings of the study are that: today’s principals should be more concerned with managing workforce diversity because it offers both potential costs high value and benefits for educational organizations especially; school principals are constrained with many factors that inhibit the management of secondary school teachers diversity and that they should manage more effectively diverse team whose members have different ages, genders and nationalities or even belong to distinct ethnic or cultural groups using different managerial tools. The study concluded that diverse work teams bring high value to educational organizations, therefore respecting individual differences will benefit the workplace, stakeholders in education should laisse with the principals to address the identified challenges on diversity management of teaching staff as principals create a competitive edge using the required managerial tools to increase work productivity. Recommendations are that: (1) The government need to ensure periodic organization-wide employee training on diversity and diversity management to ensure that all organizational members understand and appreciate the role and benefits of diversity in educational organizations and why it should be effectively managed; (2) Principals should implement policies such as conducting various motivational and mentorship programmes to provide staff access to information and opportunities so as to benefit from workplace diversity, (3) The stakeholders in education should join coalitions and partnerships with the principals to face and solve the many challenges of workplace diversity for employee performance in secondary schools in Rivers State.