Only a handful of studies have focused on understanding how authenticity in close relationships may be related to individuals’ well‐being. In this study we examined whether authenticity in a friendship was related to greater adjustment during adolescence. Participants were 318 sixth‐ and ninth‐grade students (155 boys; Mage = 13.46, SDage = 1.51). Our results show that adolescents who feel more authentic have more positive self‐views, are less lonely at school, and more satisfied with their relationship. Importantly, authenticity–adjustment associations remained significant after controlling for positive friendship quality and conflict. These findings suggest that authenticity should be more often incorporated into the study of different friendship processes.