OP may refer to:
Oprah Gail Winfrey (born Orpah Gail Winfrey; January 29, 1954) is an American media proprietor, talk show host, actress, producer, and philanthropist.
An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.
Opera (Italian: [ˈɔːpera]; English plural: operas; Italian plural: opere [ˈɔːpere]) is an art form in which singers and musicians perform a dramatic work combining text (libretto) and musical score, usually in a theatrical setting.
An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
Operation Barbarossa (German: Unternehmen Barbarossa) was the code name for Nazi Germany's invasion of the Soviet Union during World War II, which was launched on Sunday 22 June 1941. The operation was driven by an ideological desire to conquer the Western Soviet Union so that it could be repopulated by Germans, to use Slavs as a slave labour force for the Axis war-effort, to seize the oil resources in the Caucasus and to seize the grain supply in Ukraine.
Opium (poppy tears, with the scientific name: Lachryma papaveris) is the dried latex obtained from the opium poppy (scientific name: Papaver somniferum).
Open-source software (OSS) is computer software with its source code made available with a license in which the copyright holder provides the rights to study, change, and distribute the software to anyone and for any purpose.
This page lists public opinion polls in connection with the 2017 French presidential election, which will be held on 23 April 2017, with a run-off on 7 May 2017 if no candidate secures an absolute majority of the vote in the first round.
Opioids are substances that act on opioid receptors to produce morphine-like effects. Opioids are most often used medically to relieve pain, and by people addicted to opioids.