DLI may refer to: Daily light integral, the number of photons received in an area Defense Language Institute of the US DoD Delhi Junction railway station (station code DLI) Durham Light Infantry, UK Donor lymphocyte infusion, immunotherapy Delay line interferometer Digital Library of India Department of Land Information, Western Australia Data Language Interface (DL/I) to IBM's IMS databases 551 in Roman numerals Lien Khuong Airport IATA code