The objective of this study was to investigate the effects of workforce diversity on employee performance in a selected Higher Educational Institutional Sultanate of Oman. A cross-sectional research design was used. A random sample of 198 was chosen by dividing employees into homogeneous strata of academic and non-academic employees. The results showed a positive and significant relationship between independent variable gender diversity and dependent variable employee performance. The result also showed positive but insignificant relationship between independent variables age, experience and education diversity and the dependent variable employee performance. Higher Educational Institutions should introduce diversity management programs to improve the effectiveness of workforce diversity towards employee performance. The objective of this study was to investigate the effects of workforce diversity on employee performance in a selected Higher Educational Institutional Sultanate of Oman. A cross-sectional research design was used. A random sample of 198 was chosen by dividing employees into homogeneous strata of academic and non-academic employees. The results showed a positive and significant relationship between independent variable gender diversity and dependent variable employee performance. The result also showed positive but insignificant relationship between independent variables age, experience and education diversity and the dependent variable employee performance. Higher Educational Institutions should introduce diversity management programs to improve the effectiveness of workforce diversity towards employee performance.