BACKGROUND Professionalism has long been recognised as a core competency for clinical teachers as role models and educators. The present study aimed to evaluate the adherence to professionalism of clinical teachers from the perspectives of resident doctors and undergraduate medical students. METHODS This is a descriptive and cross-sectional study. All learners, including undergraduate medical students and residents who were studying in the medical school and teaching hospitals affiliated with Shahid Sadoughi University, were entered into this study as evaluators (n = 311). Of these, 151 clinical teachers were assessed by the learners. The students were asked to assess the two clinical teachers with whom they had interacted during the previous month in the clinical department. The Faculty Professionalism Evaluation Questionnaire was used in this study. RESULTS The results of the confirmatory factor analysis (CFA) confirmed the adequacy of the model. The total mean score was 1.98 (standard deviation=0.36, range = 0.96 to 2.82). In addition, the total mean score of the adherence to professionalism among clinical teachers was reported at the level of "met expectations". The results showed that the teachers' scores in the domains of "doctor-patient relationship" and "doctor-student relationship" were reported under the "met expectations" level. Their scores in the "inter-professional relationship" and "doctor-self relationship" domains were reported as "below expectations". The results showed the scores of teachers' professionalism were significantly lower from the viewpoints of residents than in the perceptions of medical students (p=0.0001). CONCLUSIONS The professionalism scores of clinical teachers were evaluated as "below expectations" from the learners' perspectives.