Hosta

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