Nadaism (Spanish: Nadaísmo, meaning "Nothing-ism" in English) was an artistic and philosophical counterculture movement in Colombia prevalent from 1958 to 1964. The movement was founded by writer Gonzalo Arango and was influenced by nihilism, existentialism, and the works of Colombian writer and philosopher Fernando González Ochoa. Nadaism was largely a movement in reaction to La Violencia and was the Colombian expression of numerous avant-garde-like movements in the poetry of the Americas during the 1950s and 60s, such as the Beat Generation in the United States and the Tzanticos in Ecuador. The movement was largely anti-establishment. It resulted in several works of literature, music, and movies expressing nadaist themes.
The term nadaísmo was a play on the words "nada", meaning nothing, and "Dadaism" (Spanish: Dadaísmo). Nadaísmo has sometimes been called "Colombian dadaism", a "Colombian Beat Generation", or "Colombian Futurism".
The violent events in Colombia during the 1940s and 1950s permeate the works of Nadaist writers. Events such as La Violencia and the military government of Gustavo Rojas Pinilla, as well as a considerable urban expansion, greatly influenced the formation of the Nadaísta (Nothing-ist) movement. Arango had originally supported Pinilla when he came to power in Colombia, joining the Movimiento Amplio Nacional (Broad National Movement) composed of artists and young intellectuals that supported the dictator. In this period, Arango devoted himself to journalism. Soon, however, the reaction of the leaders of conservatives and liberals against Rojas was manifested in an agreement that caused his fall on May 10, 1957. While the dictator was exiled in Spain, Gonzalo Arango eventually fled to Medellín, Colombia.