Tujuan dari penelitian ini adalah untuk mengidentifikasi persepsi penanaman Nilai-nilai Islam dalam Sistem Pendidikan Nasional (Sistem Pendidikan Nasional Bernafaskan Islam) di kalangan otoritas sekolah dan guru di Sekolah Menengah Swasta di Lampung Indonesia. Penelitian kualitatif diadaptasi sebagai metode dalam penelitian ini. Pendekatan fenomenologi telah dipilih dalam upaya mencapai tujuan penelitian. Formulir wawancara semi terstruktur, formulir observasi, dan analisis dokumen digunakan sebagai alat pengumpulan data. Wawancara semi terstruktur diperoleh dengan mewawancarai tiga otoritas sekolah dan tiga guru. Data wawancara ditranskrip. Selanjutnya, data dianalisis secara manual untuk menghasilkan tema. Tema-tema tersebut telah diperiksa oleh dua orang penilai yang ahli di bidangnya. Temuan penelitian ini mengungkapkan bahwa penanaman nilai-nilai Islam dalam Sistem Pendidikan Nasional telah dilakukan selama tiga puluh tahun melalui pembiasaan shalat berjamaah, membaca Al-Qur'an dan Asmaul Husna sebelum belajar, budaya salam, dan program Tahfidzul Qur'an. Mencermati hasil penelitian tersebut, pihak sekolah dan guru hendaknya mengevaluasi secara berkala terkait penanaman nilai-nilai Islam karena perkembangan globalisasi yang dirasakan kuat dan terbuka saat ini.Kata Kunci; Persepsi, Penanaman nilai-nilai Islam, Sistem Pendidikan Nasional AbstractThe purpose of this research was to identify the perception of the inculcation of Islamic Values in the National Educational System among the school authorities and the teachers at a Private Secondary School in Lampung Indonesia. Qualitative research was adapted as the method in this study. The phenomenology approach has been chosen in the quest of arriving at the objectives of the study. A semi-structured interview form, observation form, and document analysis were used as data collection tools. Semi-structured interview acquired by interviewing three school authorities and three teachers. The data of the interviews were transcribed. Subsequently, the data was analyzed manually to generate the themes. The themes have been checked by two raters who are experts in the field. The finding of this study revealed that the inculcation of Islamic values in the National Educational System has been conducted for thirty years through the habituation of prayer in congregation, reciting Qur'an and Asmaul Husna before learning, the culture of greetings, and the program of Tahfidzul Qur'an. Considering the research findings, the school authorities and teachers should evaluate regularly pertaining to the inculcation of Islamic values because of the development of globalization that felt strong and open currently.Keywords; Perception, Inculcating Islamic values, National Educational System