Herpes simplex keratitis (HSK) is a leading cause of corneal opacification and infection-related visual loss. Even though an individual may not have had the clinically apparent disease, high fever, immune-suppression, and sometimes surgery can reactivate latent herpes1. Its presentation can be distinctively divided into two types, epithelial keratitis or stromal keratitis due to a difference in pathogenesis, this inevitably postulates treatment difference. In this report, a case of postoperative herpes simplex virus (HSV) keratitis after a cataract surgery is described. The diagnosis and medical management of herpes simplex keratitis are discussed.