In this study, the effect of conflict theory based decision making skill training group applications on decision making styles of adolescents was investigated. A total of 36 students, including 18 students in experimental group and 18 students in control group, participated in the research. When assigning students to experimental group or control group. Decision Making Scale for Adolescents, Socio-Economic Status Scale, Problem Solving Inventory, Self-Esteem Scale, Locus of Control Scale, and Parental Style Inventory were used. While the experimental group participated in a psycho-educational based group application that was based upon Conflict Theory, the control group did not participate in any kind of application. The findings of the research indicated that decision making skill training group applications increased the self-esteem level of adolescents and the application of adaptive coping style, whereas there was a decline in the application of maladaptive coping style and this effect seemed to be long term.