© 2021 Turkish Psychological Counseling and Guidance Association. All rights reserved.The study aims at the effects of mindfulness-based group counseling programs on interpersonal mindfulness levels. This is an experimental study with experimental and control groups based on the pretest, posttest, and follow-up models. The research consists of couples who are married for at least 1 year and graduated from secondary education in İstanbul. The data of the study were obtained with the mindfulness in marriage scale. A 10-week mindfulness-based psychological counseling program was applied to the experimental group by the researcher. Any training was not given to the control group. Follow-up measurement for the experimental group was performed two months after the posttest. As a result of the research findings, a mindfulness-based psychological group counseling program increased the Interpersonal mindfulness scores of the couples. It is seen that there is a significant difference between the mindfulness pre-test-post-test and pre-test-follow-up test scores of the married couples in the experimental group. However, there is no statistically significant difference between the mindfulness pre-test and post-test scores of married couples in the control group.