OKL may refer to:
Oakleigh Park railway station, London, National Rail station code Oberkommando der Luftwaffe, the air force High Command of the Third Reich Olive Kettering Library, the library of Antioch College, Ohio Oberste Kriegsleitung (Supreme War Command), the supreme command of the Central Powers in the latter part of the First World War Old Kentish Sign Language (ISO 639 code okl)