Critical Thinking (CT) which has been defined as the employment of cognitive skills or strategies for obtaining sound conclusions (Halpern, 2013) has been the subject of different Second Language (L2) studies at national and international levels. The aim of the present study was to provide a meta-analysis on the (quasi) experimental studies of critical thinking in second language education in Iran. To this end, from a total of 168 studies published between 2011 and 2020, 24 studies were selected based on the inclusion-exclusion criteria. The included studies were coded to calculate the mean effect size of the studies. The results show that 1) L2 teaching was positively effective for the CT development in Iran; 2) the most beneficial aspects of L2 teaching on CT promotion were related to teaching L2 speaking and L2 rhetorical strategies; 3) concerning L2 proficiency level, L2 instruction was most advantageous for advanced students’ CT developments; 4) regarding the age groups, L2 teaching contributed the most growth in CT levels for learners in the age group of 10-14 years, and 5) L2 teaching was most effective for the undergraduate students compared to other educational levels. The findings can be beneficial for pursuing the next moves in L2 research, education, and planning educational policies in Iran.

Keywords: Critical thinking, EFL, Meta-analysis, 21st century skills, L2 teaching in Iran, Problem-solving

     

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