Introduction: Professors' communication skill is one of the main factors guaranteeing the improvement of education quality. Therefore, regarding this significant role and the special role of the students in evaluation of the professors' performance and the effect of the communication of the professor and the students on the evaluation scores, this research has investigated the relationship between the faculty members' communication skills and the results of evaluation of them by the students in Iran University of Medical Sciences. Research Method:The current study is a descriptive-analytical one of crosssectional type conducted on 10 education groups of Iran University of Medical Sciences in the academic year 2016-2017. The data collection tools were Queendom communication skill questionnaire and the scores of the evaluation of the professors' performance by the students. The SPSS13 software and statistical tests such as Pearson's correlation coefficient and variance were used for analyzing the data. Findings:The data analysis indicated that the mean score of the total communication skill was 117.77. The mean score of the evaluation of the professors was 16.68. The highest mean score of evaluation belonged to the orthopedic group (18.41), and the lowest mean score belonged to the gynecology group (15.82). Pearson's correlation coefficient indicated a direct significant relationship between the score of communication skill and the score of the evaluation by the students (p≤0.05). The variance analysis indicated that there is a significant difference between the mean scores of evaluation and communication skill of the groups (p≤0.05). Conclusion:Paying attention to the issue of communication skill of the medical sciences professors requires a special look. Therefore, it is necessary to apply appropriate planning in order to upgrade and educate this skill, especially in clinical fields, so that we can guarantee the learners' satisfaction and the education quality.