Book excerpt: This book equips school psychologists and other mental health professionals with a comprehensive understanding of mental health and well-being in adolescent girls. The text places adolescent girls in a developmental and social-cultural context and outlines factors that can shape girls’ well-being including family, peers, and media. Chapters discuss trajectories that might result in mental distress and dysfunction in adolescent girls and identify pathways to their optimal development. Additionally, the book reviews the domains of well-being including physical health and habits, emotional well-being, healthy relationships, and identity and agency. Each chapter includes theory-informed and empirically supported interventions to help promote girls’ positive physical and socio-emotional development and culminates in a list of further recommended resources for the reader. Well-Being in Adolescent Girls is a valuable resource for school psychologists, counselors, and other mental health professionals working with adolescents along with those in graduate-level courses in school psychology and school counseling programs.