In the treatment of obsessive compulsive disorder, which shows an increasing prevalence steadily, cognitive behavioral therapy, especially mindfulness based approaches described as the third wave of cognitive therapies, have been shown to be effective in the literature. The aim of this study was to examine the effects of mindfulness based cognitive therapy on obsessive compulsive symptoms. An experimental study with experiment and control groups, pre-test and post test, and follow up model was designed. The data were collected with "Personal Information Questionnaire" for the personal information, "SLC-90 Symptom Checklist" to examine the inclusion criteria of participants, and "Padua Inventory" to determine the level of obsessive compulsive symptoms. The results showed that the intervention program implemented to the experimental group caused a statistically significant decrease in the obsessive compulsive symptoms of the participants. Follow up test scores showed that experimental group maintained the decreased level of symptoms throughout four months. No significant differences were found between pre and post-test and follow up scores of the control group. According to the results, mindfulness based cognitive therapy could be used as a supportive intervention for the treatment of obsessive compulsive disorder.