This study aims to evaluate the implementation of the teacher self-development program at Al-Fatah Private Islamic Senior High School (MAS Al-Fatah) Natar, South Lampung Regency, using the CIPP (Context, Input, Process, Product) evaluation model. The evaluation covers the relevance of the program and teacher needs (context), the availability of resources and program planning (input), the implementation of self-development activities such as training, workshops, and supervision (process), and the outcomes achieved in improving teacher competence (product). This research employed a qualitative approach with a descriptive-evaluative method involving 12 teachers and 1 madrasah head as research subjects. Data were collected through interviews, observations, and document analysis over a three-month period (February–April 2025), and were analyzed using triangulation techniques. The results indicate that the teacher self-development program at MAS Al-Fatah is conducted at least once every semester and is supported by school policy and actual teacher needs. However, the program faces challenges related to funding and time allocation. Overall, the program positively impacts teacher professionalism, motivation, and instructional quality through collaborative strategies such as peer supervision, internal workshops, and teacher study groups. The study recommends enhancing needs-based planning, strengthening budget support, conducting regular monitoring and evaluation, and measuring the program's impact on student learning outcomes to ensure program sustainability and effectiveness.