This study aims to examine the role of Islamic religious guidance in enhancing the spirit of worship among inmates who have converted to Islam in correctional institutions. The increasing number of converts within correctional environments indicates a need for more intensive, focused, and personalized religious guidance to meet their spiritual needs. As individuals undergoing rehabilitation, convert inmates often face limitations in basic Islamic knowledge and low motivation to perform religious practices. Therefore, Islamic religious guidance serves as an essential instrument in shaping understanding, attitudes, and the consistent practice of Islamic teachings. This research employs a qualitative approach using a case study design. Data were collected through direct observation of religious guidance activities, in-depth interviews, individual counseling sessions, and religious lectures. The findings reveal that the implementation of Islamic religious guidance in correctional institutions contributes significantly to increasing the spirit of worship among convert inmates. Guidance activities, including instruction on prayer procedures, ablution, fasting, Quran recitation, and spiritual mentoring, effectively deepen religious understanding. Moreover, individualized counseling that emphasizes spiritual motivation, patience, and moral reflection positively influences religious awareness and encourages consistency in worship practices, particularly prayer, dhikr, and Quran reading. In conclusion, Islamic religious guidance plays a significant role in strengthening the religious spirit of Muslim converts in correctional institutions. A systematically designed and continuous guidance program, supported by personalized spiritual assistance, is a key factor in fostering religious character development and supporting the moral rehabilitation of inmates. These findings are expected to serve as a reference for correctional institutions in developing religious guidance programs and for future research on spiritual guidance in correctional settings.