Background: Oral clefts are among the most common congenital anomalies. Infants with oral clefts often have other associated congenital defects, especially congenital heart defects. The reported incidences and the types of associated malformations and congenital heart defects vary between different studies. The purpose of this study was to assess the incidence of associated congenital heart defects in children with oral clefts. Methods: All infants with cleft lip and palate referred to the Children's Medical Center and Bahramy; the teaching Hospitals of the Tehran University of Medical Sciences from 1991 to 2005 were prospectively enrolled in this study group. All patients were examined and noted by an academic cleft team contain; a pediatrician and a pediatric surgeon, and received cardiac consultation and echocardiography by a pediatric cardiologist. non cardiac associated anomalies, still born and patients without echocardiography were excluded from the study.  Data including age, gender, exposure to contagions and high risk elements ,consanguinity and familial history of oral cleft, type of oral cleft, results of cardiac consultation and echocardiography and associated cardiac anomalies were cumulated and analyzed by SSPS version 13.5Results: Among the 284 infants with oral clefts, 162 were male (57%) and 122 were female (43%). Seventy-nine patients (27.8%) had cleft lip, 84 (29.5%) had cleft palate and 121 (42.6%) had both cleft lip and palate. Of all the patients, 21.1% had congenital heart defects. the most common type Of these congenital heart defects(28.3%)  was atrial septal defect.Conclusions: For patients with cleft lip and palate, we recommend preoperative cardiac consultation, careful examination and routine echocardiography for associated cardiac anomalies, as well as appropriate management and prophylactic antibiotic therapy for those with associated congenital heart anomaly