A counterculture is a culture whose values and norms of behavior differ substantially from those of mainstream society, sometimes diametrically opposed to mainstream cultural mores. A countercultural movement expresses the ethos and aspirations of a specific population during a well-defined era. When oppositional forces reach critical mass, countercultures can trigger dramatic cultural changes. Prominent examples of countercultures in the Western world include the Levellers (1645–1650), Bohemianism (1850–1910), the more fragmentary counterculture of the Beat Generation (1944–1964), and the globalized counterculture of the 1960s (1965–1973). Countercultures differ from subcultures.

Oz was an independently published, alternative/underground magazine associated with the international counterculture of the 1960s. While it was first published in Sydney in 1963, a parallel version of Oz was published in London from 1967. The Australian magazine was published until 1969 and the British version until 1973.