The purpose of this quantitative, correlational-predictive study was to investigate whether teacher-reported psychological contract breach (PCB) and psychological contract violation (PCV) mediate the relationship between perceived diversity climate (DC) and turnover intention (TI), and the extent to which this mediated relationship, if it exists, is moderated by race (R) in the population of K-12 teachers in the United States. The framework for this study was provided by theories of diversity climate, psychological contract, and turnover intention. Research question one addressed the mediating effects of PCB and PCV. Research question two addressed the moderating effect of race on the mediated model. The study conducted online involved a convenience sample of 389 teachers (312 White and 77 Black) from 36 states. The results of the Hayes conditional process analysis for question one showed a statistically significant DC-TI predictive relationship: R2 = 0.492, F(3, 385) = 150, p < 0.001. The 95% bias corrected confidence interval (BCCI) for sequential mediation through PCB and PCV [-0.490, -0.221] did not include zero and, therefore, was statistically significant. The results for question two indicated a statistically nonsignificant moderation effect: 95% BCCI [-0.404, 0.281] included zero, total R[superscript 2] = 0.494, F(3, 381) = 65.1, p 0.05. The significant mediation findings support the theoretical framework and justify further research to incorporate PCB and PCV in interventions to reduce teacher turnover. The study results could help organizations train leaders to navigate DC, PCV, and PCV within schools to reduce teacher turnover. [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.]