OL may refer to:
Old English (Ænglisc, Anglisc, Englisc, pronounced [ˈæŋliʃ]), or Anglo-Saxon, is the earliest historical form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages.
Olivia Newton-John, (born 26 September 1948) is an English-Australian singer, songwriter, actress, entrepreneur, and activist.
An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current.
Old Norse was a North Germanic language that was spoken by inhabitants of Scandinavia and their overseas settlements from about the 9th to the 13th century.
Ole Gunnar Solskjær (Norwegian pronunciation: [ˈuːlə ˈɡʉnːɑr ²suːlʂær] (listen); born 26 February 1973) is a Norwegian football manager and former player who is the manager of English club Manchester United.
Oliver Cromwell (25 April 1599 – 3 September 1658) was an English military and political leader. He served as Lord Protector of the Commonwealth of England, Scotland, and Ireland from 1653 until his death, acting simultaneously as head of state and head of government of the new republic.
Olanzapine, sold under the trade name Zyprexa among others, is an atypical antipsychotic primarily used to treat schizophrenia and bipolar disorder.