Adolescence is a vital period in social development, because adolescents can be easily influenced by the people they develop close relationships with. At the stage of adolescence peer groups offer the opportunity to develop social skills such as empathy, sharing, and leadership. A number of family characteristics are also related to the development of prosocial and antisocial behaviour in children and adolescents. Prosocial behaviour is aimed to establish positive, empathic, co-operative and socially responsible relationships in order to benefit others. Prosocial behaviour fosters positive traits that are beneficial for children and society. Similarly their self-concept begins being much more complex and tangible than it was when they were children. Self-concept reflects how an adolescent evaluates himself or herself in domains (or areas) in which he or she considers success as important. Previous empirical evidence reveals that acting in a prosocial and altruistic manner could increase someone's self-concept. So the researchers have conducted the study of prosocial behaviour and self concept in Male and Female Adolescents, and also to identify the relationship between prosocial behaviour and self concept. The findings of the study have revealed that overall self concept of adolescents was found to be average and favourable and there was no significant difference found between self concept of male and female adolescents. The Prosocial Behaviour of adolescents was average and favourable and there was significant difference found between prosocial behaviour of male and female adolescents. There was significant relationship found between prosocial behaviour and self concept of adolescents.