This article reports the Polish adaptation of the Questionnaire to Assess Affective and Cognitive Empathy (QAACE) by Zoll and Enz - a multidimensional self-report questionnaire used to measure empathy in children aged 8-14. The QAACE is based on a two-factor cognitive-emotional model of empathy. It has a number of international adaptations and offers a convenient Polish-language tool for use with young children and adolescents. The sample consisted of 677 children aged 8-13. The survey was conducted on school premises, during classes, by an appropriately prepared researcher. Confirmatory factor analysis revealed a good fitting measurement model representing the original underlying factor structure of the QAACE among Polish children. The reliability of the questionnaire as measured by Cronbach's α and McDonald's ω was good. The reliability of the scale as assessed by the test-retest method (after four weeks) was .80. We assessed the validity of the tool by analyzing the correlation of empathy with love and sadism. General empathy, as well as cognitive and affective empathy, is positively related to love. The hypothesis that sadism is significantly related to empathy was also partially confirmed. General empathy and affective empathy are negatively correlated with sadism, while there was no relationship between sadism and cognitive empathy. The questionnaire is the first widely available tool of this type to examine empathy and its components appropriate for children and adolescents in Poland. The questionnaire can be a useful screening test for detecting children's level of empathy.