Oc, OC or O.C. may refer to:
Oceania (UK: , US: (listen), ) is a geographic region that includes Australasia, Melanesia, Micronesia and Polynesia.
An ocean (from Ancient Greek Ὠκεανός, transc. Okeanós) is a body of water that composes much of a planet's hydrosphere.
The October Revolution, officially known in Soviet historiography as the Great October Socialist Revolution and commonly referred to as the October Uprising, the October Coup, the Bolshevik Revolution, the Bolshevik Coup or the Red October, was a revolution in Russia led by the Bolshevik Party of Vladimir Lenin that was instrumental in the larger Russian Revolution of 1917–23. It took place through an armed insurrection in Petrograd on 7 November (25 October, O.S.) 1917.
OCLC, Inc., d/b/a OCLC is an American nonprofit cooperative organization "dedicated to the public purposes of furthering access to the world's information and reducing information costs".
Occupational safety and health (OSH), also commonly referred to as occupational health and safety (OHS), occupational health, or workplace health and safety (WHS), is a multidisciplinary field concerned with the safety, health, and welfare of people at work.
Occupy Wall Street (OWS) was a protest movement that began on September 17, 2011, in Zuccotti Park, located in New York City's Wall Street financial district, against economic inequality.The Canadian anti-consumerist and pro-environment group/magazine Adbusters initiated the call for a protest.
The Allied occupation of Japan at the end of World War II was led by General Douglas MacArthur, the Supreme Commander of the Allied Powers, with support from the British Commonwealth.