Organizations have been seeking methods that could maximize organizational effectiveness. Organizational psychologists believed that organizational citizenship behaviour (OCB) is one of the methods that could help to enhance organizations’ performance. Among the psychological factors, psychological capital (PsyCap) is recognized as one of the effective contributors in influencing employees’ willingness in showing OCB at the workplace. Unfortunately, it was argued that emotional or psychological aspects have been overlooked in organizational researches due to emotional is known as an irrational element among employees. Contradictorily, the theory of effective event recognizes that employees’ emotions and psychology status could affect employees’ behaviour at the workplace. Therefore, psychologists believe that, by improving employees’ psychological status, employees’ behaviour could be enhanced. Human resource practitioners should focus on psychological aspects such as PsyCap because the effort of improving employees’ behaviour has been a major task in human resource management. Hence, this review paper focused on the linkage between PsyCap and OCB, where the studies ranged from 2008 to 2018 were reviewed. From the result of reviewing, inconsistency was found on the linkage between PsyCap and OCB. Because of the inconsistency, it is recommended that future studies should conduct more studies to confirm the linkage between the variables among corporate personnel. Besides, future studies are also recommended to conduct longitudinal studies for the purpose to capture the trend of changes.