The article is devoted to a theoretical study of teacher staff turnover, taking into account the specific features of pedagogical activity and the educational environment. The relevance of the topic is determined by the steady increase in teacher turnover, which negatively affects the staffing stability of educational organizations and the quality of the educational process. The purpose of the article is to systematize scholarly approaches to defining staff turnover and to develop a refined definition of teacher staff turnover. The study employs theoretical methods of analysis and generalization of academic literature. Based on the analysis of Russian and international studies, the main interpretations of staff turnover are identified. As a result of the research, a refined definition of teacher staff turnover is proposed and a theoretical model of this phenomenon is developed, reflecting the interrelation of key factors. The study concludes that a comprehensive theoretical approach to the analysis of teacher staff turnover is appropriate and necessary.