Background/purpose: Depending on the educational institute with which they are associated, educators of standardized patients (SPs) differ in their objectives and ideals. Thus, reaching a common consensus regarding the requirements that are essential in this fi eld has proven to be exceedingly diffi cult. This study sought to provide a reference for the design of training programs and the assessment of educational outcomes in the fi eld of SPs. Materials and methods: This study used the nominal group technique to identify the essential core competencies required for SPs. Nineteen participants were invited to participate in this study: 15 experienced SPs were invited from the National Taiwan University Hospital and the Taiwan Standardized Patient Association and four physician educators were recruited from teaching hospitals around Taiwan. Results: The participants classified core competencies into two categories, namely, case performance and professionalism, and then prioritized them according to importance. The three most important case performance capabilities were accuracy, consistency, and mindfulness. The three most important professionalism capabilities were compliance, responsibility, and enthusiasm. Conclusion: The authors concluded that these six competencies of SPs form a feasible and valid framework for the SPs’ training program development.