According to the requirements of the counselor education program at Uluda÷ University, this is a 3rd year compulsory class. Students are grouped in threes and each group receives a nine-week theoretical education. After completing the theoretical education, the students practice the group process as a member and alternately as a leader. In this process, the aim is to practice group counseling skills that have been previously learned. Although this is a kind of group process serving an educational purpose, it is expected that the trainees will follow group norms (e.g., confidentiality, participation, etc.). As can be seen in the relevant studies (Corey & Corey, 2006; Furr & Barret, 2000; Yalom, 2005), the theoretical framework of group counseling and the content of skill-based training are well defined. In line with these studies, the trust, as a group dynamic, theoretically was identified with some variables such as self-disclosing (Johnson & Noonan, 1972), and risk taking (Pilkington & Richardson, 1988). However, there is a scarcity assessment of trust building in the group process. In the current study, it was aimed to investigate the process of trust building among the counselor trainees. It was hypothesized that there would be a change in the trust level among the counseling trainees who participated in group counseling practices. It’s expected to provide information about how trust building function in group counseling process and to contribute the studies related to group counseling practices in counselor education.