The purpose of this study was to examine whether collective efficacy can mediate the association between (a) coach-athlete relationship and athlete satisfaction and (b) team cohesion and athlete satisfaction. The sample consisted of 135 Greek-Cypriot athletes who participated in interactive sports and responded to four questionnaires including the Collective Efficacy Questionnaire for Sport, Greek Coach-Athlete Relationship Questionnaire, Group Environment Questionnaire and three subscales of the Athlete Satisfaction Questionnaire. The results from a series of regression analyses indicated that dimensions of collective efficacy have the capacity to explain the association between the quality of the coach-athlete relationship and athlete satisfaction as well as between team cohesion and athlete satisfaction. Unity, preparation, and ability were dimensions of collective efficacy that appeared to be the best mediators. Theoretical and practical implications are discussed.