Despite the development of effective antibiotics, subphrenic abscess continues to be a significant clinical problem. The formation of the subphrenic abscess occurs after intestinal contents and gut bacteria contaminate the abdominal cavity. Here, we report a case of a bilateral subphrenic abscess mimicking a bilateral pleural effusion and the symptoms appeared 1 year after the last abdominal operation. The uniqueness of this case was its late presentation and bilateral distribution, mimicking a bilateral pleural effusion.