This study aimed to assess the effectiveness of six thinking hats technique in teaching subjects related to sustainable development in geography classes. The study was in both a quantitative and qualitative form. The quantitative part of the study was designed according to pre-test, post-test control group research model, and in the qualitative part, answers given by students to interview questions were analyzed according to descriptive analysis method. The population of the study consisted of 650 students studying in Gaziantep Araban High School and the sample consisted of 36 students studying at 11th grade in the same school. The results of the study revealed that teaching techniques based on six thinking hats resulted in more positive results compared to other teaching techniques proposed in the curriculum.