N.B. This study is aimed at analyzing high school EFL teachers’ attitudes towards collaborative action research (CAR). This study was of both qualitative and quantitative type. In this research, the number of selected samples, based on the convenience sampling method, was 20 male and female EFL teachers teaching at the education and training organization of Isfahan Province. As an instrument of this research, they were given the standard questionnaire of Savaskan (2013) and Byrnes (2009) to fill. Then, the data were analyzed using descriptive statistics and a t-test through SPSS Software, version 25. According to the obtained results, based on descriptive statistics, both male and female teachers had a positive attitude toward collaborative action research (56.25% of the answers were under average (3) which shows a more positive attitude). Also, in comparison with the female teachers, male teachers had a more positive attitude toward collaborative action research (2.70˂2.95). Conducting such research in this realm provides an opportunity to make the right choice of teaching techniques in general, and collaborative action research and its subcategories in particular.