This study aimed to understand the effectiveness of Forgiveness Group Therapy on forgiveness and forgiveness flexibility levels among university students. 16 students who studied at Mersin University joined the study. Enright's Process Model of Psychological Forgiveness Scale was utilized when the program is designed. The group counseling program was conducted in the presence of two psychological counselors and a supervisor. The Heartland Forgiveness Scale and Forgiveness Flexibility Scale were used to gather data. The main purpose of that program was forgive to others. To analyze the effectiveness of the Forgiveness Group Counseling Therapy on forgiveness and forgiveness flexibility, the experimental design was implied. Pre and post-test were implied to two groups which were experimental and control groups. The data which collected owing to scales was analyzed by using non-parametric methods in SPSS program. The results showed that forgiveness the others and forgiveness flexibility increased for the experimental group while forgiveness of self and forgiveness of the situation wasn't.