The present paper studiedSelf-concept and Emotional Maturity of Delinquency Prone and Non-delinquency Prone Adolescents of Secondary Schools in Assam. This study is conducted on a sample of 500 adolescents comprised of 200 delinquencies prone and 300 non delinquencies prone adolescents selected randomly from 12 secondary and higher secondary schools. The descriptive survey method is used for data collection using Lidhoo’s Delinquency Proneness Scale (1989), Self-concept Questionnaire (R.K. Saraswat) and Emotional Maturity Scale (M. Bhargava and Y. Singh). The study reported that delinquency prone adolescents have low self-concept and low emotional maturity than non-delinquency prone adolescents. It found positive co-relation among self-concept and emotional maturity.