Oc or OC may refer to:
Oceania (UK: , US: ( listen), ) is a geographic region comprising Melanesia, Micronesia, Polynesia and Australasia.
Occam's razor (also Ockham's razor or Ocham's razor; Latin: lex parsimoniae "law of parsimony") is the problem-solving principle that the simplest solution tends to be the right one.
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 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 the 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 7 November (25 October, Old Style) 1917.
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.
An octane rating, or octane number, is a standard measure of the performance of an engine or aviation fuel.