This study aims to examine the transformation of communication practices among Communication Studies students as they transition from academic communication patterns to professional communication during their participation in a certified internship program. Employing a qualitative approach with a case study design, data were collected through in-depth interviews, observations, and documentation involving [number] students enrolled in the certified internship program. The findings were further validated through source triangulation involving academic supervisors and workplace mentors. Data were analyzed using thematic analysis through the stages of transcription, coding, categorization, theme identification, and interpretation. The findings reveal that students’ communication transformation unfolds through four interrelated stages: encountering the demands of professional communication, adaptation, habituation, and the internalization of workplace communication standards. This transformation is characterized by a shift from academic communication, which tends to be more elaborative and task-oriented, toward communication that is more concise, responsive, context-sensitive, and oriented toward effective task completion. These changes are evident in students’ ability to comprehend and clarify instructions, articulate ideas, produce professional written communication, interact effectively with mentors and colleagues, and adapt their messages to diverse organizational contexts. The findings demonstrate that certified internship programs serve not merely as platforms for applying academic competencies but also as transitional environments in which professional communication competencies are developed and students’ preparedness for entering the workplace is strengthened.