Job satisfaction has long been discussed as an important factor determining individual behavior at work. To what extent this relationship is also evident in the teaching profession is especially relevant given the manifold job tasks and tremendous responsibility teachers bear for the development of their students. From a theoretical perspective, teachers' job satisfaction should be negatively related to turnover intentions and absenteeism, and positively to high-quality teacher-student interactions (i.e., emotional support, classroom management, and instructional support), enhanced student motivation, and achievement. This research synthesis provides a comprehensive overview of the relationship between teachers' job satisfaction and these variables. A systematic literature search yielded 105 records. Random-effects meta-analyses supported the theoretically postulated relationships between teachers' job satisfaction and their turnover intentions, absenteeism, teacher-student interactions, and students' outcomes. Effects were significant not only for teachers' self-reports of their professional performance, but also for external reports. On the basis of the research synthesis, we discuss theoretical, conceptual, and methodological considerations that inform future research and prospective intervention approaches.