Prior to this research study, it was not known if, and to what degree a relationship exists between the four key areas of Catholic school climate (collegial leadership, teacher professionalism, academic press and institutional vulnerability) and the organizational citizenship behavior of teachers. The purpose of this quantitative correlational study was therefore to investigate the degree of relationships between these variables in Catholic schools (K-12) in the south-central region of Arizona. The school climate was measured using the Organization Climate Index (OCI) and organizational citizenship behavior was tested using Organizational Citizenship Behavior Scale (OCB Scale). The study was built on the theoretical foundation of Social Exchange Theory as well as the theoretical frameworks of school climate and organizational citizenship behavior. A convenience sampling method was used to collect data from 140 participants from 35 Catholic schools (K-12) in the south-central region of Arizona. Two correlational tests, Pearson's r and Spearman's rho, were performed to address the four research questions and their associated hypotheses. The results revealed that three areas of school climate have statistically significant relationships with OCB of teachers. These include: collegial leadership, r = 0.516, p <0.001; teacher professionalism, r = 0.783, p < 0.001; and academic press, r = 0.553, p <0.001. The institutional vulnerability aspect of school climate did not have statistically significant relationship with the OCB of teachers, r = -0.144, p = 0.089. The study limitations, strengths and weaknesses, and recommendations for practical applications and future studies were discussed. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]