This study aims to optimize tahfizh teachers' competencies in increasing students' memorization at the Tahfizhul Qur'an Darul Istiqamah Islamic Boarding School, Maros Regency. The research method used is qualitative research with a case study approach. Data was collected through interviews, observation, and document analysis. Research participants included the Head of Tahfizh, teachers, and students. The study results show that the tahfizh teacher's competencies are crucial in increasing the students' memorization. Tahfizh teachers with good pedagogic, social, professional, and personality competence can create an effective and supportive learning environment, build harmonious student relationships, and provide adequate spiritual guidance. Schools and educational institutions should pay serious attention to the development of tahfizh teachers’ competencies. Efforts such as education and training programs, teacher collaboration, and personality development must be improved. In addition, the results of this study can also contribute to the improvement of the tahfizh education’s quality in Islamic boarding schools and guide the development of more effective teaching programs.