Lyme borreliosis (LB) is the most common tick-borne disease in North America and Europe, with a strong decreasing trend. Clinical manifestations concern mainly skin, joints, nervous system and heart. In Europe, the etiologic agents are Borrelia afzelii, Borrelia garinii, Borrelia burgdorferi sensu stricto and probably Borrelia bissettii. The only pathognomonic symptom of LB is erythema migrans. Lyme carditis is a relatively rare manifestation of LB but untreated infection can lead to serious cardiac conditions, even death. Cardiac involvement is typically characterized by atrioventricular block of various degrees, though other clinical forms such as ventricular and supraventricular arrhythmias, pericarditis, myocarditis, cardiomyopathy and degenerative valvular lesions have also been reported. Carditis can be treated successfully in the majority of cases with standard antibiotic regimens. The following paper constitutes review of the current state of knowledge on Lyme carditis based on Polish and foreign literature.