Accessory gallbladder in a donor liver allograft is an uncommon anatomical finding that can complicate liver transplantation if unrecognized. This case describes a patient who underwent liver transplantation with a donor graft containing an accessory gallbladder that was obscured during transplantation; as a result, the patient experienced a prolonged postoperative course complicated by multiple readmissions for suspected biloma and intra-abdominal infection. The diagnosis of accessory gallbladder was not made until operative exploration several months after the initial transplant. Removal of the accessory gallbladder has led to resolution of clinical problems.