This summary examines the role of human resource development (HRD) practices in fostering organizational citizenship behavior, with affective organizational commitment serving as a mediator. The study utilized surveys from employees at two public universities in Saudi Arabia. Results from structural equation modeling found significant relationships between HRD practices and affective commitment, HRD practices and citizenship behavior, and affective commitment and citizenship behavior. The findings suggest HRD practices are important for enhancing affective commitment and citizenship behavior among employees, and higher commitment also leads to greater citizenship. Affective commitment was found to partially mediate the relationship between HRD practices and organizational citizenship behavior.