One of the main questions in business is how to improve management of human resources and productivity of employees. Satisfied employees have the key role when it comes to successful business management. Organizations are interested in how employees do their tasks and how does it impact on their work performance. Work performance contributes to achieving goals of the organization and that is why management of the organization want activities and results of employees aligned with organizational goals. In order for organizations to improve their business, they need knowledge of everything that impacts aspects of people behavior. One topic that permeates all the aspects of people behavior is mental health which is more and more popular when it comes to research in this field. Mental health is connected to social and physical functioning and is assumed that is one of the conditions for social and economic development of the society. In this graduate thesis, focus of the research was to find out if there is relationship between mental health and work performance of the employees. The research that was carried out in this thesis brought to the conclusion that there is relationship between mental health and work performance.