Background and aim Difficult moral situations assume more critical importance in pediatric wards since children are more vulnerable than adults. Given that professional ethics is a substantial part of children treatment, the present study was conducted to determine the ethical performance of nurses from the perspective of mothers and nurses in the pediatric wards of Be'esat Hospital in Hamadan. Materials and methods The present descriptive-analytical study was conducted on 58 nurses and 263 mothers of children referred to the pediatric wards (...) of Be'esat Hospital in Hamadan in 2019. The study samples were randomly selected. Data collection tools included the demographic form and Ethical Performance Assessment Questionnaire developed by Beykmirza et al. The obtained data were analyzed in SPSS software version 23using descriptive and inferential statistics. Results As evidenced by the obtained results, the mean ethical performance of nurses from the perspective of nurses and mothers were reported as 86.72 ± 6.397 and 69.92 ± 18.09. From the mothers' viewpoint, 27%, 39.2%, and 33.8% of nurses had weak, moderate and good levels of performance, respectively. On the other hand, from the nurses' perspective, 24.6% and 75.4% of nurses had moderate and good levels of performance, respectively. The obtained results were indicative of a statistically significant difference between the performance score as reported by mothers and nurses. Conclusion Considering that the majority of mothers rated the ethical performance of nurses as weak and moderate, it is suggested that professional ethical principles be implemented in the form of Retraining programs in an attempt to improve the ethical performance of nurses. (shrink)