Objectives: The aim of the present study was to assess multiple relationships between rumination and mood with frightening dreams. Method: The research method was descriptive and correlational. The statistical population was all students of Isfahan (Khorasgan) Islamic Azad University in 2014-2015 academic year. The sample consisted of 180 students who were selected through random cluster sampling method. The instruments used in this study were Rumination Scale, Positive and Negative Mood Scale, and Symptoms Frightening Dreams Scale. The gathered data were analyzed using descriptive statistics (frequency, mean and standard deviation) and inferential statistics (Pearson correlation and stepwise regression). Results: There was positive significant relationship between frightening dreams with rumination (p<0.000) and negative mood (p<0.009). Stepwise regression analysis showed that rumination accounts for 10.2% of frightening dreams variance. Conclusion: Rumination can predict frightening dreams and it seems that one of the ways to reduce frightening dreams is to reduce rumination and negative mood.