The main objective of this paper is to study the effect of training and development on workplace diversity in public universities in Kenya from the perspective of the senior administrators or managers of the administrative departments and the schools/faculties in order to provide empirical insights on the disparity in the workforce, which has been a challenge for the public universities’ as they need to benefit from talented people with diverse backgrounds. The study adopted a research design being a descriptive cross sectional survey design. The sampling frame was the 22 chartered public universities out of which a sample size of 245 managers surveyed. The sampling technique used was purposive sampling. Correlation and regression analysis was used to determine relationships between the independent and the dependent variable. The study established that training and development significantly affects workplace diversity.