The main purpose of this research paper would be to examine the influence of three totally different leadership styles, specifically democratic, autocratic, and laissez-faire: on oil and gas megaproject success in Malaysia. This research focuses on a mixed method approach whereby both quantitative and qualitative assessment using a questionnaire mechanism is administered to a control group of employees under the Project Management Department by using the convenience sampling technique and several face-to-face interviews. The data from both methods would be crucial to determine the final outcome on which leadership style reigns over the other. In order to evaluate further the leadership styles and project success, the design of the questionnaire consist of a one to five-point scale, and then the data interpretation is done using SPSS software. Demographic and descriptive techniques came in handy as it contributes to an in-depth analysis of the sociology approach, while Pearson's correlation and regression analysis subscribe to examining relationships between variables to justify the study hypotheses. The results and outcome showcase that both democratic and laissez-fair leadership tends to lean towards a more positive impact on mega project success, while autocratic leadership has a negative impact on project success.