OML may refer to: Old Main Line (disambiguation), various meanings in transportation Old Mutual, an international insurance company One More Light, an album by American musicians Linkin Park Order of Merit List, for the U.K. Order of Merit Outer mold line, an aeroshell's outer surface, mainly used in the context of aviation, such as in spacecraft boilerplates OML, the Indian Railways station code for Omalur Junction railway station, Salem, Tamil Nadu OML (computer format) (Outline Markup Language) is an XML format for outlines