Adolescents within the youth justice secure estate represent a uniquely vulnerable population whose voices are often marginalized. Understanding their lived experiences is crucial for developing effective and humane rehabilitation and support strategies. This systematic literature review synthesizes qualitative research exploring the perspectives of young people in secure settings. It identifies key themes related to their daily lives, relationships, education, mental health, and aspirations for the future. The findings underscore the importance of fostering positive relationships, providing tailored educational opportunities, addressing complex needs, and genuinely integrating youth perspectives into policy and practice. This review aims to contribute to a more child-centric approach within the youth justice system, advocating for environments that promote growth, well-being, and successful reintegration.