Introduction: Rumination is defined as a series of repetitive thoughts to the negative mood or events and reflection is dispositional self-attentiveness motivated by intellectual interests. The purpose of the present study was to develop a Persian version of Rumination-Reflection Questionnaire designed by Trapnell & Campbell and examine its reliability and validity. Materials and Methods: A group of 143 students from Azad University, Garmsar Branch were selected by available sampling during 2014-2015. Results: The findings showed that reliability coefficients for the 11 remaining items of Rumination-Reflection scale were 0.73, which determine 71.78% of the variance of rumination test with 3 factors of reflection, introspection, and brooding. Conclusion: The Persian version of questionnaire can be used to measure the rumination among Iranian subjects.