Relationship between employee attitudes and services quality still unclear. Therefore, the aim of this study is to uncover the relationship between organizational commitment and service quality, by investigate under which mechanism that organizational commitment effect service quality. Data were collected by means of self-administered survey, total 247 faculty staff and 1235 of their student complete responses were obtained from Aden University. The results show that, organizational commitment effect service quality by social mechanism (social exchange). More specifically, organizational commitment effect service quality by social exchange mechanism. Important implications, limitation and future studies are discussed.