The purpose of the current study was to identify putative antecedents and consequences associated with self-efficacy, other-efficacy, and relation-inferred self-efficacy, within the context of elite coach-athlete dyads. Semistructured interviews were conducted with each member of six international-level coach-athlete partnerships, and data were analyzed using inductive and deductive content analytic techniques. Results for both athletes and coaches demonstrated that the above ‘tripartite efficacy beliefs’ (cf. Lent & Lopez, 2002) were identified as originating from perceptions regarding oneself, inferences regarding the ‘other’ dyad member (e.g., the athlete’s coach), as well as the dyad as a whole. Results also revealed that the tripartite efficacy constructs were interrelated, and independently associated with a number of positive task-related and relationship-oriented consequences. Findings are considered in relation to developing and sustaining effective coach-athlete relationships at the elite level.