This study aims to examine the psychometric properties of the Persian version of the Parental Reflective Functioning Questionnaire (PRFQ) in mothers, a brief self-report measure that assesses parental mentalization capacity. To examine the factor structure and construct validity of the PRFQ, 430 mothers of 3–6-year-old children completed the Persian version of the PRFQ (Persian-PRFQ) along with the Emotion Regulation Checklist (ERC) and the Strengths and Difficulties Questionnaire (SDQ). Exploratory and confirmatory factor analyses supported the three-factor structure of the PRFQ. Convergent validity was confirmed for the three subscales of the PRFQ, while divergent validity was only confirmed for the PM and IC. Furthermore, the mean score of the certainty of mental states (CMS) in this sample was higher than in other studies, and contrary to the theoretical foundations, the CMS was positively related to interest and curiosity in mental states (IC). In conclusion, our results provided initial evidence for the use of the Persian-PRFQ in the Iranian population.