In recent years, the interest of both academics and practitioners has turned to knowledge management. However, the majority of studies had focused on the private sector versus the public sector. This research aimed to investigate the mediating role of organizational commitment in the relationship between knowledge management practices and public servants’ performance. The questionnaire consisted of four variables: knowledge management, the organization’s willingness to innovate, employee commitment and emotions at work. The research was conducted at the Managing Authority of the “Human Resources and Social Cohesion” Program in Athens. The empirical results on a sample of 100 public servants showed a moderate, positive and statistically significant relationship between Knowledge Management in the public sector and Employee Emotions. Furthermore, they confirmed a moderate and positive relationship between Knowledge Management in the public sector and employee engagement. However, employee engagement was not found to be a mediator between knowledge management and employee emotions in the public sector, it is rejected. A future survey should include a larger sample and more public organizations. Implications for further research are also discussed.