The main objective of this study was to gain insight into the experience of participation of war veterans suffering from PTSD in the group work. There were two research questions that were tried to answer, based on the experiences of the participants. The first research question tried to get an answer to the question of how veterans suffering from PTSD involved in group work experience some aspects of the group process, but on the other hand tried to get an answer to a question how veterans suffering from PTSD involved in group work experience some aspects of the personal benefit. For this purpose qualitative research approach was selected and as a collection method a semi-structured interview was chosen. Data were collected in University Hospital Center Zagreb during September and October 2016. Sample consists of nine veterans suffering from PTSD who are treated at University Hospital Center Zagreb, and there have gained the experience of participating in group work. The answers to the first research question indicate that the participants are mostly satisfied with the group process what can be inferred from their experience of the leadership role, group cohesion and group program. Answers to the second research question showed that the participants recognize certain personal benefit from participation in group work what can be infered from their experience of the acquainting and socializing, and normalization of trauma-related problems. Also, results showed that participants recognize emotional relief caused by the participation in the group. It is possible to conclude that there is a therapeutic effect of participation in group work on the emotional state of the participants.