Iatrogenic complete AV block (ICAVB) has long been noted as a major complication after congenital heart surgery (CHS), contributing to complex postoperative care and potentially affecting patient outcomes. A retrospective review of the Pediatric Health Information System database from 1/1/04-09/30/23. All patients who underwent a Society of Thoracic Surgeons benchmark procedure were included. International Classification of Diseases 9th and 10th editions were utilized to identify diagnoses and procedures. All patients with a diagnosis of CAVB and placement of permanent pacemaker after CHS but in the same hospitalization were identified as ICAVB patients. A total of 42,332 patients were identified with 17,106(41%) female, 23,042(55%) Non-Hispanic White and median age of 5.4[IQR:0.4-25.8] months. Of those, 246(0.6%) had iatrogenic CAVB. The procedure with highest incidence of iatrogenic CAVB was the arterial switch operation with ventricular septal defect repair (ASO+VSD) (74/1552, 4.5%). On multivariable analysis, ASO+VSD had the highest adjusted odds of iatrogenic CAVB (OR:5.41 (95%CI:3.57-8.19), p<0.001) when compared to isolated VSD repair. A diagnosis of endocarditis was significantly associated with iatrogenic CAVB. Center volume was not associated with iatrogenic CAVB. Iatrogenic CAVB was associated with a 121% (95%CI:98.5-146.8) increase in length of stay (p<0.001) and increased in-hospital mortality (OR:2.26 (95%CI:1.34-3.82), p<0.001). The overall incidence of iatrogenic CAVB following CHS is low. However, certain procedures have incidences as high as 4.5%. Iatrogenic CAVB is associated with increased post-operative mortality and length of stay. Further work is needed to identify drivers of variation between centers to improve overall outcomes.