The purpose of this study was to evaluate the reliability and validity of the Norwegian version of the Pediatric Nurses' Knowledge and Attitudes Survey Regarding Pain (PNKAS-N) in nurses who work with children in pain. The PNKAS was translated into Norwegian in accordance with international guidelines and pilot tested with 10 nurses. The reliability was estimated using Cronbach's alpha coefficient and the test-retest method using Pearson's r coefficient. Construct validity was established by comparing the scores of 79 nurses and 104 nurse specialists. Face and content validity were satisfactory. Acceptable levels of reliability were demonstrated by a Cronbach's alpha coefficient of 0.71 and Pearson's r coefficient of 0.83. The questionnaire discriminated between nurses and nurse specialists (p < 0.001). The PNKAS-N demonstrated adequate reliability and validity, and is applicable for the evaluation of pediatric nurses' competency in pain management.