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Third World

Fourth World, the feudal fantasy land shared by the teenage protagonists of Peter Jackson's film Heavenly Creatures.

Developing countries

Either of two Jon Hassell albums, Fourth World, Vol. 1: Possible Musics and Fourth World, Vol. 2: Dream Theory in Malaya, named for this concept

First World

Least developed countries

Second World

Unrepresented Nations and Peoples Organisation

Fourth World, a term used by trumpeter Jon Hassell to describe a style of music employing modern technological treatments and influenced by various cultures and eras.

Fifth World

4th World, a term coined by Manuel Castells to refer to black holes of social exclusion.

The Fourth World (album), the debut album of the band Kara's Flowers.

Fourth World refers to "Least Developed Countries" or to other notably marginalized or oppressed groups, (ie. indigenous peoples) living in Third World or First World countries.

Fourth World, the current world according to the Hopi belief system and Maya mythology; the coming age is the Fifth World.

Jack Kirby's Fourth World, a mythologically-oriented group of comic books created by Jack Kirby at DC Comics in the early 1970s.