BackgroundSince the emergence and worldwide spread of the new coronavirus (COVID‐19) pandemic, it has caused people to experience adverse psychological effects. This study aimed to assess anxiety levels during COVID‐19 in children with chronic kidney disease (CKD), including nephrotic syndrome (NS) and kidney transplantation (Tx).MethodsA case‐controlled, cross‐sectional study was conducted with children aged 10–18 years, who had a diagnosis of CKD or NS, or Tx, and followed in our center between April and July 2020. A healthy control group was recruited with age‐ and gender‐matched children. A questionnaire with printed and online versions was designed in three parts: the first addressed demographic characteristics, the second addressed opinions about the pandemic, and the third was the Turkish version of the Revised Child Anxiety and Depression Scale – Child Version.ResultsA total of 88 children completed the questionnaire. The patient and control groups were similar in terms of gender, age, household members and history of psychiatric treatment. Both groups stated that coronavirus is a risky disease for children (63.6%), and that they were afraid of contagion (69.3%). Only half of them were receiving realistic and informative answers from family members. In the Revised Child Anxiety and Depression Scale – Child Version, 66% of them received a high score on at least one subscale. The social phobia scores of the control group were higher than those of the patient group, although the proportion of high scores was similar in both groups. The ratio of high‐scored participants was higher in CKD patients for panic disorder, and was lower in the immunosuppressive agent group for social phobia.ConclusionThe current COVID‐19 pandemic is a disaster that children encounter for the first time in their lives. It does not exclusively cause anxiety among children with chronic kidney diseases but also affects healthy children.