OL may refer to:
Arts and entertainment
- Orphaned Land, an Israeli progressive metal band
- Old Lace (comics) a telepathically linked dinosaur hero
Businesses and organizations
- OLT Express Germany (IATA code: OL), a scheduled and charter airline based in Emden in Germany
- Open Library, an online project intended to create "one web page for every book ever published"
Places
- OL postcode area, for parts of Greater Manchester and Lancashire, surrounding Oldham, England
- Oulu railway station, Finland (abbreviated OL)
Science and technology
- -ol, a suffix for chemical compounds that are alcohols
- Guillaume-Antoine Olivier, in botanist or zoologist author citations (Ol.)
<ol></ol>, an HTML tag for creating ordered list elements- Optics Letters, a journal published by the Optical Society of America
- A Unified Soil Classification System symbol for organic silt and/or clay
Sport
- Olympic Games, an international sport event
- Olympique Lyonnais, a prominent French association football club based in Lyon
- Olympique Lyonnais Féminin, the women's football section of the above club
- OL Reign, an American women's soccer team primarily owned by the parent company of Olympique Lyonnais
- Offensive lineman, a player who plays on the offensive line of scrimmage in American football
Other
- Office lady, a low-tier female office worker in Japan
- Ol Chiki alphabet
- Old Lancastrians, alumni of Lancaster Royal Grammar School, England
- Old Lawrentians, alumni of St Lawrence College, Ramsgate, England