In separate studies, researchers have found that transformational leadership style of managers and follower's perceptions of procedural justice have relationship with follower's trust in manager. Current study aims at studying role of these variables by testing two structural models (model 1 and 2) in educational organizations. A sample including 652 teachers of boy's primary schools in 10 educational districts of Tehran were selected and data were collected through 3 questionnaires. After construct validity and reliability analysis of latent variables, direct and indirect effects of transformational leadership on teacher Trust in Principal and mediating role of teacher perception of procedural justice in two models and also goodness of fit indexes of models were analyzed. Result showed that in both models transformational leadership has indirect effect and in model 2 has also direct effect on trust in principal. Also in both models, transformational leadership has direct effect on procedural justice and procedural justice has direct effect on trust in principal and emerges as a significant mediator between transformational leadership and trust in principal. Comparison of mediating role in both models indicates that procedural justice can make mediating role partially. Goodness of fit indexes indicates that model 2 better fit with observed data. The results were discussed in the final section of the article.