Undergraduate students should be prepared with both knowledge-based information and the necessary attitude that encourages them to take responsibility for their actions towards the environment. The civil engineering programme in Malaysia has embedded sustainability-related matters, equipping students with knowledge on sustainability, as well as Sustainable Development Goals (SDGs). However, knowledge itself is insufficient to ensure an environmentally friendly attitude, where personality traits may also influence attitude. This study aims to explore the relationship between personality traits and environmental sustainability attitudes among Civil Engineering graduating students at the largest university in Malaysia. This study is critical in determining whether the current curriculum and pedagogical approach have shaped the students’ personalities, thereby influencing their personality and attitude in the context of environmental sustainability. The Big Five Personality Traits, also known as the Five Factor Model, were employed to study the personality traits of civil engineering students and their relationship to environmentally sustainable attitudes. A total of 226 final-year students completed a survey, which included the Big Five Personality Traits survey and attitude towards environmental sustainability. The findings suggest that most of the civil engineering undergraduate students possess traits of openness and have a positive attitude toward environmental sustainability. In addition, the traits of agreeableness and openness were predictors of environmental sustainability. This demonstrates that the civil engineering curriculum the students followed throughout their time at the university was beneficial in shaping their attitudes towards becoming better engineers who will protect the environment in the future. This study also highlighted the importance of identifying and shaping students’ personality traits in preparing them for future job challenges.