English as a Medium of Instruction is a strategy developed by educational institutions to integrate subjects taught in English into the curriculum of secondary and primary education or university degrees. This study investigates student satisfaction and the challenges of implementing English as the Medium of Instruction (EMI) in Business English courses. A mixed-method approach was utilized, with data collected through a questionnaire administered via Google Forms to 320 second-semester management students. Qualitative data were supplemented through structured interviews. Descriptive analysis revealed that 91.8% of students are very satisfied with their lecturers' expertise, 91.3% are very satisfied with their lecturers' English ability, 77.8% are satisfied with the EMI status of the institution, and 76.4% are satisfied with the effectiveness of EMI. However, the interview results further revealed the challenges faced by students, which were categorized into language-related challenges: speaking difficulties, listening difficulties, lack of vocabulary, and writing difficulties. Culture-related challenges: no cultural barriers. Material-related challenges: lack of understanding of materials and completion of academic assignments. Institution-related challenges: all students felt supported by the institution and lecturers.