Abstract: Sustainability issues have become a global agenda, demanding a strategic role for the education sector in building pro-environmental awareness and behavior. The Adiwiyata Program is an Indonesian government policy aimed at systematically and sustainably instilling environmental values in educational institutions. However, studies examining the holistic process of school transformation from education to ecological action and the formation of a sustainable school culture are still relatively limited, particularly in the context of Islamic schools (madrasahs). This study aims to analyze in depth the transformation process of MTsN 11 Jombang in implementing the Sustainable Adiwiyata Program to achieve the National Adiwiyata School designation. The study used a qualitative approach with a case study design. Data were collected through observation, semi-structured interviews, and documentation studies with the madrasah principal, Adiwiyata mentors, teachers, and Adiwiyata cadres. Data analysis was conducted using the interactive model of Miles, Huberman, and Saldana through the stages of data reduction, data presentation, and conclusion drawing. The results of the study indicate that the transformation of MTsN 11 Jombang took place gradually and systematically through strengthening environmentally conscious madrasah policies, integrating environmental values into the curriculum and learning, developing environmental actions based on the participation of madrasah residents, and providing environmentally friendly facilities and infrastructure. This process was supported by the commitment of the leadership, the active involvement of madrasah residents, and collaboration with external stakeholders. This transformation resulted in the formation of an ecological madrasah culture and increased pro-environmental behavior of students. This study provides empirical and practical contributions in the form of a sustainable Adiwiyata madrasah transformation model that can be replicated in similar educational units. Keywords: environmental education; Adiwiyata; sustainability; school culture; madrasah Abstrak: Isu keberlanjutan telah menjadi agenda global yang menuntut peran strategis sektor pendidikan dalam membangun kesadaran dan perilaku pro-lingkungan. Program Adiwiyata merupakan salah satu kebijakan pemerintah Indonesia yang bertujuan menanamkan nilai-nilai kepedulian lingkungan secara sistematis dan berkelanjutan di satuan pendidikan. Namun, kajian yang mengulas proses transformasi sekolah secara holistik dari edukasi menuju aksi ekologis dan pembentukan budaya sekolah berkelanjutan masih relatif terbatas, khususnya pada konteks madrasah. Penelitian ini bertujuan untuk menganalisis secara mendalam proses transformasi MTsN 11 Jombang dalam mengimplementasikan Program Adiwiyata Berkelanjutan hingga memperoleh predikat Sekolah Adiwiyata Nasional. Penelitian menggunakan pendekatan kualitatif dengan desain studi kasus. Data dikumpulkan melalui observasi, wawancara semi-terstruktur, dan studi dokumentasi terhadap kepala madrasah, pembina Adiwiyata, guru, serta kader Adiwiyata. Analisis data dilakukan menggunakan model interaktif Miles, Huberman, dan Saldana melalui tahapan reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian menunjukkan bahwa transformasi MTsN 11 Jombang berlangsung secara bertahap dan sistematis melalui penguatan kebijakan madrasah berwawasan lingkungan, integrasi nilai lingkungan dalam kurikulum dan pembelajaran, pengembangan aksi lingkungan berbasis partisipasi warga madrasah, serta penyediaan sarana prasarana ramah lingkungan. Proses ini didukung oleh komitmen pimpinan, keterlibatan aktif warga madrasah, serta kolaborasi dengan pemangku kepentingan eksternal. Transformasi tersebut berdampak pada terbentuknya budaya madrasah yang ekologis dan peningkatan perilaku pro-lingkungan peserta didik. Penelitian ini memberikan kontribusi empiris dan praktis berupa model transformasi madrasah Adiwiyata berkelanjutan yang dapat direplikasi pada satuan pendidikan sejenis. Kata kunci: pendidikan lingkungan; Adiwiyata; keberlanjutan; budaya sekolah; madrasah