This study aims to investigate the impact of cooperative learning on the financial literacy of secondary school students in Tehran. Financial literacy, as one of the essential skills in modern societies, plays a significant role in making informed financial decisions and improving individuals' economic well-being. On the other hand, cooperative learning, as a novel educational method, can lead to improved social skills and deeper learning through student interaction and collaboration. In this research, the Kolmogorov-Smirnov test was used to check the normality of the data, and Pearson correlation and multiple regression analysis were employed for data analysis. The statistical population included secondary school students in Tehran, with a sample size of 200 students selected through simple random sampling. The results showed that all components of cooperative learning (group interactions, individual and group responsibility, and communication and collaborative skills) had a significant positive correlation with financial literacy components (financial knowledge, financial behaviors, and financial attitudes). Specifically, the Pearson correlation coefficient for the relationship between group interactions and financial literacy was 0.543, between individual and group responsibility and financial literacy was 0.476, and between communication and collaborative skills and financial literacy was 0.512. These findings highlight the importance of utilizing cooperative learning methods to improve students' financial literacy. It is recommended that schools pay special attention to strengthening these methods in their curricula. Additionally, organizing training workshops for teachers and developing comprehensive financial education programs can help improve students' financial knowledge and skills.