Oc or OC may refer to:
Oceania (UK: or US: ) is a geographic region comprising Melanesia, Micronesia, Polynesia and Australasia.
The October Revolution (Russian: Октя́брьская револю́ция, tr. Oktyabr'skaya revolyutsiya, IPA: [ɐkˈtʲabrʲskəjə rʲɪvɐˈlʲutsɨjə]), officially known in Soviet literature as the Great October Socialist Revolution (Вели́кая Октя́брьская социалисти́ческая револю́ция, Velikaya Oktyabr'skaya sotsialističeskaya revolyutsiya), and commonly referred to as Red October, the October Uprising, the Bolshevik Revolution, or Bolshevik Coup was a revolution in Russia led by the Bolsheviks and Vladimir Lenin that was instrumental in the larger Russian Revolution of 1917. It took place with an armed insurrection in Petrograd on 25 October (7 November, New Style) 1917.
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.
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 is an international socio-political movement against social and economic inequality and the lack of "real democracy" around the world.
An octane rating, or octane number, is a standard measure of the performance of an engine or aviation fuel.