The aim of this study was to examine the effects of the Six Thinking Hats program on moral judgment and critical thinking in children aged 12 to 15 years. This study employed a quasi-experimental pre-test-post-test design with a control group. The sample included 60 children aged 12 to 15 years, randomly assigned to experimental and control groups. The experimental group underwent the Six Thinking Hats program for eight weeks. The Critical Thinking and Moral Judgment scales, both validated and reliable, were used for data collection. Data were analyzed using Analysis of Covariance (ANCOVA). The results indicated that the Six Thinking Hats program had a significant effect on critical thinking in the experimental group (p < 0.05), while no significant effect was found on moral judgment. The experimental group performed better on critical thinking tests compared to the control group, but no notable changes were observed in moral judgment. The Six Thinking Hats program can be an effective tool for enhancing critical thinking in children aged 12 to 15. However, its impact on moral judgment was not significantly evident. These findings suggest that the program may need to be combined with other educational interventions to improve moral judgment.