This study investigated the connection between Iranian EFL teachers’ fluid and crystallized intelligence and their implementation of brain-friendly teaching methods. Brain-friendly teaching aims to create environments conducive to effective thinking, problem-solving, and well-adjusted behavior. The study involved 200 EFL teachers from language institutes in Iran, tests to measure participants’ fluid and crystallized intelligence, as well as a brain-friendly teaching inventory. The results, analyzed through Spearman’s rho correlation, indicated a significant correlation between teachers’ intelligence and their use of brain-friendly teaching methods. These findings suggest potential implications for English teachers, educators, and language supervisors in enhancing teaching practices.