Personality traits are defined as formal and common modes of perception, behavior and thinking. These are stable individual differences that shape an individual's specific forms of cognition, emotion, and behavior. Personality traits and their relations with various constructs are frequent subject of psychological research. One such construct is procrastination. Procrastination is defined as a maladaptive or dysfunctional strategy that people use when coping with a conflict or a choice. Procrastination has implications for various domains of human life - from education, social life, career and even health. Because of these implications, there has been more and more research on procrastination. Academic achievement is also often examined in relation to other variables, including procrastination. The aim of the study was to examine the relationship between personality traits (honestymodesty, emotionality, extraversion, agreeableness, conscientiousness, and openness to experience) and procrastination and relationship between procrastination and academic achievement. The data was gathered through an online questionnaire, which was forwarded to social networks. The HEXACO-PI-R personality questionnaire and the Tuckman procrastination scale were used as measurement instruments. In addition, information on participants’ average grade at university was also collected. There were 137 participants in the study. The results showed that there is a negative correlation between procrastination and honesty-modesty, extraversion and conscientiousness, and a positive correlation between procrastination and emotionality, comfort and openness to experience. A negative correlation between procrastination and academic achievement was also found.