Group mentoring programs offer multiple routes for influencing development, through both one-on-one relationships and relational processes in the group context. Less explored is how the group context impacts one-on-one relationships. This study investigated how the group influences the development of the mentor-mentee relationship in a group and one-on-one mentoring program serving early adolescent girls. Qualitative analyses of interviews with mentees and mentors indicated: (a) regularly scheduled group meetings provided stability to dyads; (b) the integration of the group curriculum with the time set aside for one-on-one interactions fostered openness within dyads; (c) the group created a network that helped dyads be more attuned to their own relationships; and (d) peer group dynamics impacted dyads. We propose a process model on the way the group influences mentoring relationships across time by linking findings to theory and research. Theoretical implications for relational developmental systems theory and practical implications for programs are discussed.