Pleural endometriosis is a rare manifestation of endometriosis that usually presents with catamenial symptoms, with or without complications. Here, we present a case of incidentally discovered pleural involvement of endometriosis in an asymptomatic young female. Pleurocentesis revealed bloody exudative pleural effusion with lymphocytic predominance. Thoracoscopy revealed inflamed parietal pleura, and the biopsy confirmed endometriotic involvement.