This research was conducted to identify the personality types patterns of Bahasa Melayu teachers in secondary schools as well as analysing the relationship between teachers’ personality and teaching styles. 100 Bahasa Melayu teachers from around Malaysia were selected as respondents using purposive sampling method. This research employed a quantitative methodology. Research instruments used to collect data for this research were a set of questionnaires translated from The Big Five Inventory (BFI) by John in 1990 and Grasha Teaching Styles in 1996. Descriptive analysis which focusses on frequency and mean were selected. Inferential statistics which is Pearson correlation analysis was employed to analyse the relationship between teacher’s personality and teaching style. The finding shows that the most dominant teacher’s personality dimension s conscientiousness, followed by extraversion, openness, neuroticism, and the least personality among Bahasa Melayu teachers was agreeableness. Apart from that, Bahasa Melayu teachers in secondary schools are prone to practice expert teaching style followed by the formal authority style, facilitator style, personal model style, and the delegator style. The correlation test also showed that there was a significant relationship between teacher’s personality and teacher’s teaching style. In conclusion, personality affected teaching styles of Bahasa Melayu teachers in various secondary schools which in turns benefited the students.