Purpose: This paper aims to identify and investigate barriers to multicultural education in Iran. Design/methodology/approach: This research is a qualitative research that was done using the phenomenological method. Participants included all experts and key informants in the field of multicultural education in the country who were selected as a statistical sample in different stages of the research using purposeful sampling. The semi-structured interview was used to collect information. Two ways, including member checking and external auditing, were used to validate the information. The thematic analysis method (theme analysis), which is based on open and core coding, was used to analyze the data. Findings: The interview data revealed that barriers are generally identified in both structural and executive parts. The structural part had two main obstacles, political and scientific-professional, and the executive part had two technical and socio-cultural barriers. Also, barriers to multicultural education in curriculum design are the ideological education system, lack of a clear framework for multicultural education, etc. Furthermore, barriers to multicultural education in the curriculum implementation are hidden curriculum, the inability of teachers to implement multicultural education, etc. Finally, barriers to multicultural education in curriculum evaluation are misconception of evaluation and limited evaluation methods. Originality/value: To the best of the authors' knowledge, this study is the first one that presents the experts' viewpoints and experiences on the barriers to multicultural education in Iran.