This study examines correctional officers’ persuasive communication strategies in the Environmental Orientation Program (Mapenaling) to build trust among new inmates at Class IIB Siborong-Borong Correctional Institution. It aims to describe the strategies used by officers and identify factors that support and hinder trust-building. The study employed a qualitative descriptive approach. Data were collected through interviews, observation, and documentation, then analyzed through data reduction, data presentation, and conclusion drawing. The analysis uses the concepts of ethos, pathos, and logos, alongside the trust dimensions of ability, benevolence, and integrity. Findings indicate that ethos is reflected in officers’ professionalism, fairness, firmness, and ability to understand inmates’ characteristics. Pathos appears through friendliness, empathy, attention, advice, and personal communication. Logos is demonstrated by clear explanations of rights, obligations, rules, and institutional procedures, including repeated explanations when needed. Supporting factors include approachable communication, direct interaction, fair treatment, attention to inmates, and internal guidance for officers. Barriers include reluctance to communicate, differences in character and comprehension, emotional distress among new inmates, and uneven access to specialized communication training. The findings suggest that consistent, humane, and clear communication can support trust during the initial adaptation period.