<p>Interpersonal mindfulness plays a vital role in adolescents’ social functioning, particularly in enhancing emotion regulation and relationship satisfaction. However, research concerning interpersonal mindfulness among adolescents remains limited. In this context, we conducted two studies to explore (a) the construct validity of the Interpersonal Mindfulness Questionnaire in adolescents and (b) the complex link between interpersonal mindfulness, emotion regulation, and peer relationships among adolescents. Study 1 demonstrated the validity of the four-dimensional model of interpersonal mindfulness among adolescents, involving “Being Caught in the Mind,” “Body-Anchored Presence,” “Attention to and Awareness of the Other Person,” and “Mindful Responding.” Study 2 focused on the complex relationship between interpersonal mindfulness, emotion regulation, and peer relationships, aiming to explore the network structure, bridge nodes, and gender differences through network analysis. Study 2 collected self-reported data from middle-school students (<i>n</i> = 806, mean age = 14.78 years, SD = 1.02; 47.8% girls), revealed a strong positive connection between “Body-Anchored Presence”, “Attention to and Awareness of the Other person”, “Mindful Responding”, “Cognitive Reappraisal”, and “Peer Relationships” in the network structure. “Cognitive Reappraisal,” “Body-anchored Presence,” and “Attention to and Awareness of the other Person” exhibited the highest bridge strength. Additionally, no gender differences were found in the network structure and bridge nodes for interpersonal mindfulness, emotion regulation, and peer relationships. These findings reveal that the body and interactive aspects of interpersonal mindfulness and cognitive reappraisal play important roles in adolescents’ positive peer relationships, providing evidence for the embodied and embedded effects of interpersonal mindfulness.</p>