Influenza infection most commonly affects the upper and lower respiratory tracts, but can involve also extrapulmonary sites, including the myocardium. We report a case of a previously healthy adult diagnosed with pneumonia complicated with myocarditis caused by H1N1 influenza virus, and we review the literature on influenza myocarditis. The patient was male, 37 years old, and presented in the emergency department on January this year, with fever, pleuritic chest pain and shortness of breath of ten days duration. Chest X-ray and CT-scan findings depicted bilateral infiltrates compatible with severe pneumonia and the test for H1N1 in nasopharyngeal secretions was positive for H1N1. Because of elevated cardiac enzymes and abnormal electrocardiograph (ECG), myocarditis was suspected and finally confirmed by Cardiac Magnetic Resonance (CMR). We concluded that myocarditis of various severity is an unusual and potentially fatal complication of H1N1 infection and high level of clinical suspicion is essential for timely diagnosis and treatment.