This study aims to examine the effects of friendship skills training on the quality of friendship and subjective well-being of adolescents. In order to determine the experimental and control groups, the Friendship Quality Scale and the Adolescent Subjective Well-Being Scale were administered to 311 students in 9th, 10th and 11th grade classes from a state school in Iskenderun in Hatay during the 2015-2016 education year. As a result, 21 students who had lower than average scores were included in the study. Students who participated in the study were assigned to the experimental and control groups randomly. An 8-session psycho-education program ("Beginning Friendships, Maintaining and Protecting Training") which were developed by Morganett (2013) have been conducted with the students in the experimental group while the control group received no treatment. After the sessions, the same measurement tools were applied on both the experimental and control groups. The data gathered was analyzed by using the Wilcoxon Signed Ranks Test to examine the effectiveness of the training program. The analysis of the data has indicated an increase in the friendship quality and subjective well-being of the students who attended the friendship skills training group while there was no change in the friendship quality and subjective well-being of the students in control group.