The aim of this study is to examine the moderator effect of leader-member exchange in the relationship between perceived supervisor support and turnover intention. The research data was obtained from the employees (managers, engineers and technicians) of three public defense industry organizations operating in the Ankara region. 411 employees participated in this research. Correlation and regression analysis were applied by SPSS 26 program. The results of the analysis revealed that there is a negative relationship between perceived supervisor support and turnover intention, and leader-member exchange has a moderator effect in this relationship. On the other hand, there is a positive relationship between perceived supervisor support and leader-member exchange and a negative relationship between leader-member exchange and turnover intention.