We determined the incidence, type and severity of complications after cardiac catheterization in children with heart disease in Norway and present the results in terms of the International Paediatric and Congenital Cardiac Code (IPCCC) nomenclature for complications. All 2 pediatric cardiac catheterizations in Norway are performed in one clinical center. All procedures performed during a five-year period beginning in 2010 were prospectively registered, and medical records for cases with complications were reviewed to confirm the event and to re-classify the type, severity and attributability of the complication according to the IPCCC nomenclature. Univariate and multivariate analyses were performed to identify possible risk predictors. A total of 1318 catheterizations performed on 941 patients were included in the study, of which 68 % were interventional. The complication and major complication rates were 5.5 % and 1.4 %, respectively. Trauma to vessels or myocardium, hemodynamic adverse events and arrhythmias were the most common types of complications.In the multivariate model, weight < 4 kg (OR, 3.0; 95 % CI: 1.6 -5.8) and risk category 5 (OR, 5.1; 95 % CI: 2.1 -12.3) were significant risk predictors for any complication. In spite of a high rate of interventions, the complication rates in this study were similar to older studies, but diverging methods and terminology limit the comparability. We strongly suggest general use of the proposed IPCCC classification system for registration and reports of complications to pediatric heart catheterizations.