Number of angioplasties (PCI) of chronic total occlusion (CTO), defined as a closure of coronary artery lasting for more than 3 months, has increased during last years. According to unpublished data of Polish Cardiac Society average success rate of CTO PCI is around 50%. It may be due to lack of knowledge of polish cardiologists regarding CTO procedures. These procedures are one of the hardest in interventional cardiology and they require special training. Aim of this study was to assess knowledge about CTO among polish cardiologists as well as to assess knowledge regarding indication, qualification and technical aspects of CTO procedures. Studies were conducted with self-designed questionnaire during International Conference of Polish Cardiac Society and interventional cardiology conference – New Frontiers of Interventional Cardiology. Basic on findings from questionnaire we can conclude that level of knowledge of physicians not associated with interventional cardiology is too low which may contribute to worse treatment of patients with CTO – choosing medical therapy instead of PCI. Among interventional cardiologists knowledge regarding qualification and indication for CTO is high however still not sufficient. Technical aspects of CTO are not well known to all invasive cardiologists. The results show that there is a need for further education in regard of CTO procedures.