This article aims to integrate over two decades of empirical research findings on teachers' organizational commitment (OC) to explore its antecedents and outcomes. Via a criteria-based approach, 68 peer-reviewed quantitative empirical articles published between 1994 and 2018 were identified and included for analysis. A systematic review revealed three core themes: demographic, within-person, and role-related predictors of teachers OC; interpersonal and contextual predictors of teachers' OC; and outcomes of teachers OC. Our review detected major "blind spots" related to antecedents, mediators, and moderators, and outcomes. Recommendations are provided to help advance knowledge on teachers' OC in upcoming decades.