Oc or OC may refer to:
Oceania (UK: , US: (listen), ) is a geographic region comprising 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. It took place with an armed insurrection in Petrograd on 7 November (25 October, O.S.) 1917. The Bolshevik Party and the left fraction of Socialist Revolutionary Party - a fraction calling to stop the war and land to the peasants with overwhelming support from the countryside - actually had a majority in the Russian population.
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.
Occitan (English: , Occitan: [utsiˈta], French: [ɔksitɑ̃]), also known as lenga d'òc (Occitan: [ˈleŋɡɔ ˈðɔ(k)] (listen); French: langue d'oc) by its native speakers, is a Romance language.
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.
The Occupy movement, an international progressive, socio-political movement, expressed opposition to social and economic inequality and to the lack of "real democracy" around the world.