Surrealism is an art and cultural movement that developed in Europe in the aftermath of World War I in which artists aimed to allow the unconscious mind to express itself, often resulting in the depiction of illogical or dreamlike scenes and ideas. Its intention was, according to leader André Breton, to "resolve the previously contradictory conditions of dream and reality into an absolute reality, a super-reality", or surreality. It produced works of painting, writing, photography, theatre, filmmaking, music, comedy and other media as well.

Works of Surrealism feature the element of surprise, unexpected juxtapositions and non sequitur. However, many Surrealist artists and writers regard their work as an expression of the philosophical movement first and foremost (for instance, of the "pure psychic automatism" Breton speaks of in the first Surrealist Manifesto), with the works themselves being secondary, i.e., artifacts of surrealist experimentation. Leader Breton was explicit in his assertion that Surrealism was, above all, a revolutionary movement. At the time, the movement was associated with political causes such as communism and anarchism. It was influenced by the Dada movement of the 1910s.

The term "Surrealism" originated with Guillaume Apollinaire in 1917. However, the Surrealist movement was not officially established until after October 1924, when the Surrealist Manifesto published by Breton succeeded in claiming the term for his group over a rival faction led by Yvan Goll, who had published his own surrealist manifesto two weeks prior. The most important center of the movement was Paris, France. From the 1920s onward, the movement spread around the globe, impacting the visual arts, literature, theatre, film, and music of many countries and languages, as well as political thought and practice, philosophy, and social and cultural theories.

The word surrealism was first coined in March 1917 by Guillaume Apollinaire. He wrote in a letter to Paul Dermée: "All things considered, I think in fact it is better to adopt surrealism than supernaturalism, which I first used" [Tout bien examiné, je crois en effet qu'il vaut mieux adopter surréalisme que surnaturalisme que j'avais d'abord employé].

Apollinaire used the term in his program notes for Sergei Diaghilev's Ballets Russes, Parade, which premiered 18 May 1917. Parade had a one-act scenario by Jean Cocteau and was performed with music by Erik Satie. Cocteau described the ballet as "realistic". Apollinaire went further, describing Parade as "surrealistic":

This new alliance—I say new, because until now scenery and costumes were linked only by factitious bonds—has given rise, in Parade, to a kind of surrealism, which I consider to be the point of departure for a whole series of manifestations of the New Spirit that is making itself felt today and that will certainly appeal to our best minds. We may expect it to bring about profound changes in our arts and manners through universal joyfulness, for it is only natural, after all, that they keep pace with scientific and industrial progress. (Apollinaire, 1917)

The term was taken up again by Apollinaire, both as subtitle and in the preface to his play Les Mamelles de Tirésias: Drame surréaliste, which was written in 1903 and first performed in 1917.

World War I scattered the writers and artists who had been based in Paris, and in the interim, many became involved with Dada, believing that excessive rational thought and bourgeois values had brought the conflict of the war upon the world. The Dadaists protested with anti-art gatherings, performances, writings and art works. After the war, when they returned to Paris, the Dada activities continued.