The goal of this study was the translation and psychometric validation of the Melbourne DMQ Decision Making Questionnaire. 177 students, from various fields of study and years at the Faculty of Croatian Studies of the University of Zagreb, partook in the study, with 82.5% female and 17.5% male participants. The average age of the participants was 21.92 (SD = 3.53). The study was conducted in groups at the end of different lectures, where participants were shown a QR code on a projector screen, scanning of which would open a Google Form. The Melbourne DMQ Questionnaire, IPIP 20, Rosenberg Self-Esteem Scale, and a life satisfaction item were used in the study. The results showed good reliabilities for the subscales of vigilance (α = 0.795), hypervigilance (α = 0.738), and decision-making self-esteem (α = 0.795), as well as high reliabilities for the subscales of buck-passing (α = 0.872) and procrastination (α = 0.856). Factor analysis confirmed the existence of four factors. Inadequate decision-making styles were moderately interrelated, while vigilance was not associated with other styles. Decision-making self-esteem was moderately negatively correlated with buck-passing, procrastination and hypervigilance, and weakly positively correlated with vigilance. Moderate negative correlations were found between self-esteem and maladaptive patterns, and a moderate positive correlation was found between decision-making self-esteem and self-esteem as measured by the Rosenberg Self-Esteem Scale. Life satisfaction was slightly negatively correlated with buck-passing and weakly negatively correlated with procrastination and hypervigilance. Conscientiousness showed a weak positive correlation with vigilance and a moderate negative correlation with procrastination. Additionally, weak to moderate positive correlations were found between vigilance and emotional stability and intellect, and weak to moderate negative correlations were found between maladaptive styles and extraversion, emotional stability, and intellect. Based on the results obtained, it can be concluded that the translation of the Melbourne questionnaire has satisfactory and acceptable metric characteristics.