This study aims to investigate service-learning outcome of university English majors in Taiwan. The participants include 38 students who participated in the service-learning program at a university in Taiwan. The Chinese version of the Common Outcome Measurement Questionnaire (COM) was applied to collect data for the study. It is found that service-learning students reported the highest service-learning outcome in the domain of general knowledge application, followed by team skills and intercultural competence; and their lowest service-learning outcome is in the domain of communication skills, followed by problem-solving skills, and self-understanding/ confidence. Relationships between service-learning outcome and students’ gender, position (leaders/members), and their service-learning experience were also reported. Based on the findings, practical recommendations are discussed at the end of this paper.