This study investigates the influence of psychosocial factors on adolescent maladjustment in secondary schools in Nigeria, with a focus on family background, parents’ socio-economic status, peer influence, and self-concept. The research aims to determine the correlation between these variables and maladjustment among in-school adolescents. Using a survey research design, data was collected through questionnaires administered to 200 secondary school students in selected schools in Abuja. The study found that family background, parents’ socio-economic status, peer influence, and self-concept significantly impact adolescent maladjustment. The findings provide empirical evidence for schools, parents, and students, highlighting the nature of adolescent development and its effects on behavior. Recommendations are made for future research in this area, emphasizing the importance of understanding and addressing psychosocial factors in adolescent education and development.