Cavernous sinus syndrome is characterized by multiple cranial nerve palsies manifesting with ophthalmoplegia, ptosis, facial sensory loss due to involvement of adjacent cranial nerves. Tumor, trauma, and non-infectious inflammatory disorders are principal causes of cavernous sinus syndrome. Rhinocerebral mucormycosis is one of the fatal causes of cavernous sinus syndrome usually in immunocompromised patients. Here is a case of cavernous sinus syndrome complicating occlusion of the internal carotid artery by necrotizing fungal sinusitis, which is highly suspicious of rhinocerebral mucormycosis with non-immunocompromised state.