The primary objective of this research was to explore how the mindsets and perseverance of English as a Foreign Language (EFL) teachers in Iran impact their well-being. Using Structural Equation Modeling (SEM), data from 375 EFL teachers, selected through convenience sampling, were analyzed. The results revealed a direct and positive correlation between a teacher's growth mindset and their well-being. Additionally, the study found that the relationship between a teacher's growth mindset and well-being was influenced by their level of grit. These findings suggest that educators can significantly contribute to fostering growth mindsets and perseverance among EFL teachers, thus improving their well-being. Ultimately, this research underscores the importance of these teacher characteristics in enhancing the well-being of EFL instructors and offers practical guidance for educators aiming to support them.