Background:Sustainability has become a central theme in global policy and institutional reform, yet itspractical implementation within prison systems remains underexplored. Prisons, as closed andresource-intensive environments, present both unique challenges and untapped opportunitiesfor sustainability.Purpose:This study investigates the degree to which Hungarian prisons incorporate sustainablepractices, using the Three Pillars of Sustainability framework, which encompasses social,environmental, and economic dimensions, as an analytical lens. Method:An Interpretative Phenomenological Analysis (IPA) was employed to examine the livedexperiences and insights of five participants, including prison staff and sustainability experts.3Semi-structured interviews were conducted to explore their perceptions of sustainabilitywithin correctional settings.Conclusion:The results show that while sustainability initiatives exist in Hungarian prisons, particularlyin infrastructure upgrades, vocational training, and mental health support, implementationtends to be fragmented and driven by cost-efficiency rather than holistic sustainability goals.The findings highlight a gap between theoretical frameworks and operational realities,underscoring the need for more integrated, participatory, and ecological value-drivenapproaches to sustainability in carceral institutions.