Abstract Objective: Chylothorax after surgery for congenital heart disease is an uncommon but serious complication that adversely affects surgical outcomes. The aim of our study was presenting our experience for the management of postoperative chylothorax and excess nonhemorrhagic pleural drainage. Methods: Medical records of patients with excess nonhemorrhagic pleural drainage were retrospectively reviewed and the collected data included demographics, surgical procedures, drainage characteristics, methods of postoperative management, and outcome. Results: From March 2011 to May 2018, 52 patients with excess postoperative pleural drainage were identified from a total of 816 pediatric patients operated upon for congenital cardiac disease, giving an incidence of 63.7%. Tetralogy of Fallot and single ventricle morphology were the most common cardiac pathology. The serum triglyceride level was checked and found elevated in 30 patients (53.5%). The maximum daily drainage was 136.25 ± 109.7 mL/day and the mean duration of drainage was 32.23 ± 35.7 days. Medium-chain triglyceride formula was given for 27 patients (51.9%), octreotide for 22 (42.3%) for a mean duration of 8.07 ± 28.3 days. Total parenteral nutrition was needed for 11 patients (21.1%) for a mean duration of 3.13 ± 7.63 days. The success rate for conservative management was 94.2%. Thoracic duct ligation performed for three patients. The mean duration of mechanical ventilation was 7.4 ± 3.6 days, mean intensive care unit stay was 29.6 ± 35.1 days, and mean total hospital stay was 20.9 ± 17.5 days. We had six cases of hospital mortality (11.53%). Conclusion: Initiation of a stepwise approach for excess nonhemorrhagic pleural drainage based on the amount and rate of drainage achieve a favorable outcomes.