Pulmonary mucormycosis is a rare but life-threatening, fungal infection that usually occurs in patients with immunocompromised conditions, such as diabetes mellitus and hematologic malignancies. Anti-fungals and/or surgery are treatment modalities for this disease. Isolated pulmonary mucormycosis in immunocompetent patient is extremely rare and a mortal fungal infection. Late diagnosis may cause increased morbidity and mortality. We report herein a case of an immunocompetent 37-year female, who presented with a massive hemoptysis and was treated with urgent right lower lobectomy on a suspicion of fungus ball on tomography scan. The specimen was reported as pulmonary mucormycosis on histopathological examination. Key Words: Mucormycosis, Hemoptysis, Cavitary lesion, Immunocompetent.