Introduction: Participation in social and physical activities contributes to the social, physical and psychological development of youth. With the increasing importance of participation in physical activity in the fight against obesity, social support to direct youth to physical and social activities and the existence of programmes covering such activities gain importance. Social support for youth to participate in physical activities is related to their leisure time management planning. Aim: The main aim of the research is to identify the relationships between youth perceptions of social support for participation in physical activity and their leisure use and attitudes towards it. Method: The study used a relational screening model. The questionnaire form designed to measure the perception of social support in physical activities and leisure time management attitude was applied face-to-face to high school graduated youth (n=1012). Findings: In the demographic data of the research, the findings that 92.2% of the participants are overweight, 71.1% (n=720) do not exercise regularly, 70.6% do not have membership to clubs, etc. that organize music, art or sports activities, and although they know that various activities are held in the living space (n=542, 53.6%), they are not aware of the activities (n=591, 58.4%) come to the fore. Originality and value: According to the results of the study, it was found that there was a positive relationship between peers and parents in the perception of social support. It was also found that perceptions of social support from parents and peers positively predicted leisure time management attitudes at a weak level. It is suggested that practices and activities to support the physical activity of youth should be increased and institutional solutions should be produced within the Ministry of Youth and Sports.