Adolescence is a time when young people develop emotionally, socially, and cognitively which presedes to disorders such as anxiety, depression, and maladjusted conduct. Parenting styles, peer relations and their implications on social media use are of note in semi-urban areas like Gwagwalada. Despite the extensive individual-dimensions research based on these factors, very few studies have investigated them within the Nigerian context for their combined effects on adolescent mental health. To this effect, the study used correlational survey design to collect data from 350 adolescents who are form two (J.S.S.2) and form three (J.S.S.3) students from public and private schools in Gwagwalada were selected using stratified random sampling technique. Data were obtained from self-report instruments: the Mental Health Inventory adapted by Brian PhD, Parenting Style Questionnaire adapted by Akogh Cater Ph.D., Peer Interaction Scale developed by Umerah L.C., And Social Network Engagement Index developed by Amechi Nnamdi Suleman. The data collected was analyzed using Pearson correlation coefficient and multiple regression analysis in SPSS with p-value set at 0.05 or less while considering ethical procedures that include parental consents and anonymity of participants in the process of data collection. The results showed that there was a significant positive relationship between parenting styles and peer relationships as they related to mental health: r = .4879, P < .0001; r = .5286 P < .0001 but there was an inverse relationship with use of social media: r = -.3212 P < .0012 all contributing to 58.2% significance level of variance observed (R=0.754 F(3/359)=150). From these findings it can be inferred that the elements essential for adolescent well-being include supportive parenting, positive peer interactions as well as judicious application of media technologies. The paper therefore recommended among other things that authoritative parenting should be promoted through parent education programmes; children should be supported to develop prosocial peer relations for mutual support against risky media practices hence increased resilience system for improved psychological wellbeing system within school learning environment hence need safety programs in place system incorporation programme partnering relevant agencies so more support available defend maladaptive behaviours reduce societal threats active child development initiative additional intervention effort protectors divisive activities offer structure allows growth protection continuum within which circumstantial guard liabilities