This chapter introduces the leadership efficacy model applied to sports coaching. It is proposed in the model that leadership efficacy depends on the congruence between the conceptual cycle of leadership and the practical cycle of leadership and also by considering the leadership styles assumed by coaches and the moderating influence of the antecedent factors of leadership. This chapter discusses how these three elements of the model (leadership cycles, leadership styles, and the antecedent factors of leadership) apply to sports coaches and concur to explain their efficacy in leading athletes and teams. The model includes four hypotheses (congruence of leadership cycles, optimal leadership profile, favourability of conditions for leadership, and optimized congruence hypothesis of leadership) that will be presented according empirical finding about leadership and sports coaching. The final part of the chapter presents some practical implications of the model to the work of coaches.