Idiopathic orbital inflammation is a benign condition that affects the orbit and the extra-orbital structures. It presents as ocular pain, peri-orbital swelling, proptosis, and restricted ocular movements. This condition is diagnosed based on clinical features that are then confirmed by radiological and histopathological findings. Corticosteroids are the initial therapy of choice. Disease-modifying antirheumatic drugs are added in steroid non-responsive patients. Rituximab is now becoming increasingly used as a third-line therapy for this disease. We report a case of idiopathic orbital inflammation treated with rituximab monotherapy without the use of corticosteroids or disease-modifying antirheumatic drugs.