Maxilla is one of the facial bones with rich vascular supply. Necrosis of maxillary bone is rare and may occur due to infection, trauma and rare metabolic disorders. Maxilla is essential bone forming the roof of oral cavity. Mucormycosis is one of the most common fungal infection, which affects maxilla especially in diabetes and immunocompromised patients. We report a case of maxillary necrosis due to mucormycosis in an uncontrolled diabetic patient. Early diagnosis and prompt treatment can reduce the mortality and morbidity of this lethal fungal infection.