Transformation in the national education, a dynamic education environment, and limited resource capability do not allow schools to function effectively if teachers are solely working on their own tasks. Hence, the educational sector greatly depends on teachers who are willing to exhibit organizational citizenship behaviour which is discretionary behaviour beyond their own tasks. Particularly, this study aims to investigate the influence of servant leadership and proactive personality on organizational citizenship behaviour. In this research, a total of 610 questionnaires were distributed to the public secondary school teachers in Perlis, Kedah, Penang, and Perak. From the total, only 466 samples were used for analysis purposes. The partial Least Squares-Structural Equation Modeling (PLS-SEM) technique was employed to analyse the relationships between the variables. The result revealed that servant leadership and proactive personality have a positive and significant direct influence on organizational citizenship behaviour. Therefore, the findings suggested that school leaders and policymakers to emphasise the servant leadership practice among the principals and encourage teachers to be more proactive in improving the organizational citizenship behaviour.