<b><i>Introduction:</i></b> While identity problems and materialistic value endorsement have been described as predisposing factors for buying-shopping disorder (BSD) in the literature, little empirical data are available on the role of socially undesirable personality features that may contribute to financial misconduct and manipulative interpersonal behaviors in BSD. The dark triad of personality refers to such offensive yet non-pathological personality traits and has been applied to addictive behaviors in the past. The aim of the present study was to investigate whether the “dark triad” dimensions Machiavellianism, subclinical narcissism, and subclinical psychopathy predict symptoms of BSD above and beyond identity confusion and materialism, or moderate the relationship between materialism and symptoms of BSD. <b><i>Method:</i></b> The participants comprised a convenience sample (<i>N</i> = 272, 72.4% women) aged between 18 and 67 years. Assessment included standard questionnaires for BSD, identity problems, materialism, and the dark triad of personality. <b><i>Results:</i></b> Zero-order correlations indicate a weak association between BSD and the dark triad dimensions Machiavellianism and narcissism, but not psychopathy. Results of a moderated regression analysis with BSD symptoms as a dependent variable revealed significant main effects for materialism, female gender, and a significant “narcissism by materialism” effect, after accounting for identity confusion/synthesis and the single dark triad traits. <b><i>Conclusion:</i></b> The findings suggest that individuals with BSD attempt to address their narcissistic deficits via materialistic possessions. This assumption warrants further investigation in a clinical sample.