Adolescents are an age group vulnerable to emotional, social, and psychological changes, making mental health an important aspect that requires attention. In this study, families, especially parents, play a strategic role as the closest environment that can help adolescents cope with life's pressures through healthy interpersonal communication. This study aims to determine parental interpersonal communication patterns in supporting adolescent mental health in Banda Aceh City. The study used a descriptive qualitative approach, collecting data through in-depth interviews. The research informants numbered seven: three parents, three adolescents aged 17–20 years, and one child and adolescent psychologist. Data analysis was carried out through data reduction, data presentation, conclusion, and verification. The results show that parental interpersonal communication patterns play an important role in maintaining adolescent mental health through five main aspects: openness, empathy, support, positive attitudes, and equality. Openness provides a safe space for adolescents to share; empathy makes adolescents feel understood; support increases self-confidence; positive attitudes strengthen self-esteem; and equality encourages adolescents to feel valued. However, equality remains a challenge due to the influence of traditional parenting patterns and hierarchical family cultures. This study concludes that parental interpersonal communication is a protective factor for adolescent mental health. Therefore, parents need to build more open, empathetic, supportive, positive, and participatory communication in their daily lives.