Abstract: This study goal is to describe the participant’s behavior in private sectors of Kuwait. The study introduces two dimensions of organizational behavior: Trust and commitment. It tests a controller impact of commitment in the form of trust participant has in the organization and her or his OCB behavior in private sectors of Kuwait. Based on the sample of 400 respondents and the opinion of the respondents were obtained by using 19 questions, covering the following variables: Individuals Affective Trust (IATF), Individuals Cognitive Trust (ICTF), Affective Commitment (ACF), Continuance Commitment (CCF) and OCBF. Results proved that commitment in form of Affective and Continuance had a controlling role in the relationship between trust and OCB. However, the continuance commitment had negative impact on the OCB (dependent variable) and ICTF and IATF trust (independent variables). On the other hand, the Affective commitment had positive effect on the OCB and (dependent variable) and ICTF and IATF trusts.