Abscess of the liver ligaments is extremely rare, and abscess of the falciform ligament has been sporadically reported. We report the case of a 3 years old male who presented with a three days history of right upper quadrant abdominal pain, fever and nausea. The ultrasound and computed tomography (CT) scan showed an abdominal wall abscess located anterior to the liver. The patient underwent surgery. Abscess of the falciform ligament secondary to a ruptured liver abscess was found. Excision of the falciform ligament including the abscess was performed. Although pathology of the falciform ligament is rare, it should be included in the differential diagnosis of acute abdomen.