Background and aims: There is a considerable amount of research on the psychological antecedents and outcomes of gaming disorder. Although many studies have examined various personality traits or motivations as predictors in isolation, fewer studies have investigated the mediations between personality traits and motivations. Furthermore, the analyzed personality traits have been limited to a few core concepts, with the Big Five personality traits being a standard model in this context. However, more recently the dark triad of personality traits (Machiavellianism, narcissism, and psychopathy) has been found to be associated with various forms of problematic online behavior and usage, such as online gambling, yet little is known about gaming disorder. The current study examines the relationship of these dark personality traits to gaming disorder with three gaming motivations (achievement, social, and escapism) as mediators. Method: The study uses an online survey of 1,502 German digital game users. Results: Results indicate a fully mediated association for narcissism via escapism and partial mediation associations for Machiavellianism and psychopathy. Direct effects on gaming disorder were observed for Machiavellianism and psychopathy. Indirect effects by psychopathy were observed via escapism and social motivation, by narcissism via escapism, and by Machiavellianism via social motivation. Discussion and conclusions: These findings contribute to the theoretical understanding of the mediation of gaming motivations and the dark triad personality traits’ importance for gaming disorder.