Studies on the organisational citizenship behaviour (OCB) is still new in Malaysia, especially among teachers. The importance of OCB in an organisation has been proven to improve individual performance and productivity. Meanwhile, personality plays an important role in influencing OCB. Therefore, this study will identify whether a teacher's personality influences OCB. This quantitative study was carried out by collecting data from a questionnaire distributed to 287 people that consists of teachers from SBT (High Performance Schools) and daily schools in primary schools around Putrajaya. The Big Five Inventory Instrument by John and Srivastava (1999) is used to measure the five-factor personality and the measurement scale of Organizational Citizenship Behavior (OCB) by Podsakoff et al. (1990) to measure OCB. Data was analysed by multiple regression using Statistical Package for Social Science version 23. The results showed that neuroticism, agreeableness and openness influenced OCB among teachers as a whole. The impact of this study can help the MOE identify the characteristics of the candidate teachers who match the OCB required in the selection and placement of teachers. The MOE can also devise self-awareness intervention modules to maintain and improve OCB among teachers. Future studies need to examine the influence of personality upon the more specific OCBs so that the performance of teachers is always maintained at its peak.