TBI may refer to: Medicine toe-brachial index, a parameter for the diagnosis of peripheral arterial disease Total body irradiation, a form of radiation therapy used most commonly in bone marrow transplantation Tracheobronchial injury, an injury to the trachea or main bronchi Traumatic brain injury, a physical trauma to the brain Triamcinolone benetonide, a glucocorticoid Other TBI plc, an airport owner and operator Tennessee Bureau of Investigation, the criminal investigative arm of the state government of Tennessee The Bourne Identity (novel), a 1980 spy thriller by Robert Ludlum The Bourne Identity (2002 film), a film adaptation of the novel Trade Bank of Iraq, a publicly owned bank headquartered in Baghdad, Iraq TBI Bank, a privately owned bank headquartered in Sofia, Bulgaria Throttle Body Injection, a type of fuel injection system used on internal combustion engines TBI Solicitors, a UK-based law firm Task-based instruction, an alternative name for task-based language learning, an approach to language learning and language teaching Television Business International, a magazine published in the UK by KNect365, the Knowledge & Networking division of Informa See also