The aim of this study was to determine parental knowledge of bacterial endocarditis prophylaxis (BEP). Parents of 135 patients attending a pediatric cardiology clinic in a university center were mailed an eight-question survey pertaining to their knowledge of their child's cardiac disease, medications, and BEP. The patients' cardiac lesions and current medications were verified by a review of clinic and echocardiographic records. Each patient's need for BEP was determined according to American Heart Association (AHA) recommendations. Eighty-four (62%) parents returned complete surveys. The patients' mean age was 5 years with a range of 9 weeks to 19 years. Eighty-two (98%) respondents were high school graduates. Fifty-two (62%) respondents correctly defined endocarditis. Eighty-two (98%) parents knew the correct name of their child's cardiac condition and 27/32 (84%) knew the names of their child's current medications. Only 36/64 (56%) parents of at-risk children knew measures to prevent endocarditis. While most parents know the name of their child's heart lesion and current medications, parental knowledge of endocarditis and BEP was limited. Intensified education and awareness programs are needed in order to prevent potential major morbidity and mortality for pediatric patients with heart disease.