The purpose of this descriptive study was to investigate the effect of classroom simulation on third-year baccalaureate nursing students' self-efficacy in health teaching. Bandura's self-efficacy model provided the conceptual framework. A nonprobability, convenience sample of 22 students completed the self-efficacy questionnaire before and after the simulation workshop sessions. Students' overall self-efficacy scores increased significantly (p = 0.001) following the two sessions of role-playing case studies, suggesting more perceived confidence in performing health teaching. Recommendations include continuing the use of simulation as a teaching-learning method, applying simulation as a strategy to enhance other learner behaviors, and cultivating faculty's use of simulation in their teaching.