The research highlights the need for identifying factors influencing decision-making processes in romantic relationships. This study examined whether attachment styles could explain variance in decision-making process in romantic relationships above and beyond the personality traits. The sample included 428 Turkish adults (70.3% females, M-age = 24.69, SDage = 5). Participants completed the Relationship Deciding Scale, Big Five Inventory, and Relationship Scales Questionnaire. Correlation analysis showed that relationship decision-making correlated with personality traits and attachment styles. Regression analyses revealed that preoccupied and secure attachments significantly predicted decision-making in romantic relationships above and beyond the personality traits. The results suggest that attachment styles are important in explaining decision-making in romantic relationships that may be useful for research and practice focusing on romantic relationships.