While customer orientation is accepted as a core marketing principle, this research suggests that an opposing orientation—product orientation—may offer an advantage. Managers who follow a product orientation focus on products that interest and inspire them rather than on products that fulfill consumers’ desires. This research suggests that a consumer's perception that managers follow a product orientation is consistent with prior conceptualizations of brand authenticity. That research suggests that brands perceived as authentic are evaluated more positively, yet that research does not empirically assess brand authenticity's effects nor suggest its antecedents. To fill this gap, the authors develop a conceptualization and model of brand authenticity grounded in self‐determination theory, attribution theory, and extant authentic human brand research. Brand authenticity is defined as the extent to which consumers perceive that a brand's managers are intrinsically motivated in that they are passionate about and devoted to providing their products. The model proposes four antecedents of brand authenticity—two related to rare brand behaviors (uniqueness and scarcity), and two related to stable brand behaviors (longevity and longitudinal consistency). It also proposes two perceptual outcomes of brand authenticity—expected quality and trust. Two 2 × 2 experiments (n = 136 for Study 1; n = 155 for Study 2) demonstrate a positive impact of the antecedents on brand authenticity and of brand authenticity on the outcomes. Brand authenticity mediates these effects.