Although employees are expected to contribute to the development of organization with their knowledge, ideas, opinions and suggestions, they sometimes prefer to remain silent. Perceived justice, especially procedural justice can be important in employers' decision to speak up about organizational issues. This study aims to examine the effects of justice on faculty members' silence. It also aims to study whether trust in supervisor mediate the effect of perceived justice on faculty members' silence. Our study showed perceived justice predicts faculty members' silence. Trust in supervisor is found to mediate the effect of perceived justice and perceived procedural justice on faculty members' silence. (C) 2012 Published by Elsevier Ltd.