Leadership style and coach feedback plays an important role in the performance and success of a team. In order to investigate the relationship between feedback and leadership style of coaches and the collective efficacy of players in Khorasan Football Premier League in season 91-92, a descriptive study was performed in which 225 players were participated using random sampling. Measurement instrument was a questionnaire on leadership feedback constructed by the researcher that its face and content validity was approved by academic authorities. Confirmatory factor analysis was used for data analysis, Kolmogorov–Smirnov test for normality of data distribution, Pearson correlation coefficient for examining the relationship between feedback and coaches' leadership style and the collective efficacy and leadership style, the regression analysis for prediction of one or more variables and Cronbach alpha test for the reliability of the data. There is a significant correlation between coaches' leadership feedback and collective efficacy and training and instruction, democratic and social support leadership styles, while there was no significant leadership between collective efficacy, autocratic leadership styles and positive feedback. Comparing the coaches' leadership style revealed that football coaches used training and instruction leadership style (task-oriented) more than democratic leadership style. So, it seems that coaches' leadership style especially social support and autocratic leadership styles have a high relationship with collective efficacy. The impact of leadership style and coaches feedback on coaching efficacy and success of athletic teams highlights the importance of using appropriate leadership style more than ever.
