OL may refer to:
Olivia Newton-John, (born 26 September 1948) is an English-Australian singer, songwriter, actress, entrepreneur, dancer, and activist.
"Old Town Road" is a song by American rapper Lil Nas X. It was initially released independently on December 3, 2018, and gained popularity on social video sharing app TikTok.
Old English (Ænglisc, Anglisc, Englisc, pronounced [ˈæŋɡliʃ]), 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.
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 centuries.
Olanzapine, sold under the trade name Zyprexa among others, is an atypical antipsychotic primarily used to treat schizophrenia and bipolar disorder.
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 "and of the dominions thereto belonging" from 1653 until his death, acting simultaneously as head of state and head of government of the new republic.