Traumatic carotid-cavernous fistula is a disease in which an arteriovenous fistula forms between the cavernous sinus of the brain and the internal carotid artery passing through it. It is often associated with severe cases of head trauma, especially with skull base and mesofacial fractures. Here we report a case of mandibular fracture alone with an internal carotid cavernous sinus fistula.