This study was conducted to investigate dietary adaptations and use of university foodservice in Korea according to the religion of international students. The survey was conducted from April to June in 2017 and included 609 subjects studying at a university in Busan. Muslims showed the highest percentage of eating three meals per day (42.4%) but the highest rate of eating unbalanced meals (64.7%) and midnight meals (41.8%). The most frequent problematic eating habit among Buddhists was irregular mealtimes (46.0%). Adaptation frequency to Korean diet was lowest among Muslims and highest among Christians. Securing halal foods was difficult for Muslims in Korea, and demand for halal foods as a school restaurant menu was high. The response rate for experiencing Korean food at university foodservice was highest among Christians (79.7%) and lowest among Muslims (45.3%). The main reason for not using university foodservice for Muslims was “no menu to eat” for religious reasons, and other religious groups cited “lack of menu variety.” Preferred types and recipes of meats, fish, and vegetables also showed significant differences according to religion. As a result, efforts should be made to increase adaptation to life abroad in Korea, including changes in university foodservice management, considering the religious characteristics of international students.