Aim: Cardiac catheterizations have become the standard in the diagnosis and treatment of children with congenital heart defects and are adequately replacing open heart surgery. This paper aims to analyse cardiac catheterizations performed in the paediatric population at the Rijeka Clinical Hospital Centre. Subjects and methods: This retrospective study included all children aged 0-18 years, who for any reason had an indication for cardiac catheterization in the period from January 1, 2016 to December 31, 2021. The data were obtained from the hospital information system (IBIS) and the subjects’ medical history. The gender and age of the subjects, number and type of catheterization, types of interventions and complications per procedure were analysed. Results: In the last six years, 183 cardiac catheterizations were performed in 175 children; 78 (42.6%) were diagnostic, and 105 (57.4%) were interventional. Of the total catheterizations, 78 (43%) were performed on girls. In the age group of children younger than 10 years, 108 catheterizations (59%) were performed, of which the majority were in infants (N=25 or 13.7%). The most common intervention was transcatheter closure of the atrial septal defect (N=85, 47.2%). Complications were rare (N=10, 5.5%), with no deaths. Conclusion: In recent years, the number of diagnostic catheterizations has decreased while the number of interventional catheterizations has increased simultaneously. Cardiac catheterizations in children at Clinical Hospital Centre Rijeka are procedures with an extremely low percentage of complications and results that match those of other European centres.