OL may refer to:
- Olympic Games, an international sport event
- Office lady, a low-tier female office worker in Japan
- Old Lawrentians, alumni of St. Lawrence College, Ramsgate, England
- Olympique Lyonnais, a prominent French football club
- OpenLuna
- Optics Letters, a journal published by the Optical Society of America
- Orphaned Land, an Israeli progressive metal band
- Offensive Lineman, a player who plays on the offensive line of scrimmage in American football
- a Unified Soil Classification System symbol for organic silt and/or clay
- Ostfriesische Lufttransport (IATA code: OL), a scheduled and charter airline based in Emden in Germany
- Ol Chiki script
- the standard abbreviation for Oulu railway station, Finland
- OL!, a non-political youth organization in Azerbaijan
- -ol, the suffix of chemical compounds that are alcohols
ol, an HTML element for creating ordered lists- Old Lace (comics) a telepathically linked dinosaur hero