Jean Maurice Eugène Clément Cocteau was a French writer, designer, playwright, artist and filmmaker. Cocteau is best known for his novel Les Enfants Terribles (1929), and the films Blood of a Poet (1930), Les Parents Terribles (1948), Beauty and the Beast (1946) and Orpheus (1949). His circle of associates, friends and lovers included Kenneth Anger, Pablo Picasso, Jean Hugo, Jean Marais, Henri Bernstein, Yul Brynner, Marlene Dietrich, Coco Chanel, Erik Satie, Albert Gleizes, Igor Stravinsky, Marie Laurencin, María Félix, Édith Piaf, Panama Al Brown, Colette, Jean Genet, and Raymond Radiguet.

Cocteau was born in Maisons-Laffitte, Yvelines, a village near Paris, to Georges Cocteau and his wife, Eugénie Lecomte; a socially prominent Parisian family. His father was a lawyer and amateur painter who committed suicide when Cocteau was nine.

Cocteau soon became known in Bohemian artistic circles as The Frivolous Prince, the title of a volume he published at twenty-two. 

In his early twenties, Cocteau became associated with the writers Marcel Proust, André Gide, and Maurice Barrès. In 1912, he collaborated with Léon Bakst on Le Dieu bleu for the Ballets Russes; the principal dancers being Tamara Karsavina and Vaslav Nijinsky. During World War I Cocteau served in the Red Cross as an ambulance driver. This was the period in which he met the poet Guillaume Apollinaire, artists Pablo Picasso and Amedeo Modigliani, and numerous other writers and artists with whom he later collaborated. Cocteau wrote the libretto for Igor Stravinsky's opera-oratorio Oedipus rex, which had its original performance in the Théâtre Sarah Bernhardt in Paris on 30 May 1927.

An important exponent of avant-garde art, Cocteau had great influence on the work of others, including a group of composers known as Les six. In the early twenties, he and other members of Les six frequented a wildly popular bar named Le Boeuf sur le Toit, a name that Cocteau himself had a hand in picking. The popularity was due in no small measure to the presence of Cocteau and his friends.

Cocteau's opium use and his efforts to stop profoundly changed his literary style. His most notable book, Les Enfants Terribles, was written in a week during a strenuous opium weaning. In Opium: Journal of drug rehabilitation, he recounts the experience of his recovery from opium addiction in 1929. His account, which includes vivid pen-and-ink illustrations, alternates between his moment-to-moment experiences of drug withdrawal and his current thoughts about people and events in his world.

Cocteau's experiments with the human voice peaked with his play La Voix humaine. 

In the 1930s, Cocteau had an affair with Princess Natalie Paley, the daughter of a Romanov Grand Duke and herself a sometime actress, model, and former wife of couturier Lucien Lelong.[8] Cocteau's longest-lasting relationships were with the French actors Jean Marais and Édouard Dermit (fr), whom Cocteau formally adopted. Cocteau cast Marais in The Eternal Return (1943), Beauty and the Beast (1946), Ruy Blas (1947), and Orpheus (1949).

Cocteau died of a heart attack at his chateau in Milly-la-Forêt, Essonne, France, on 11 October 1963 at the age of 74. His friend the French singer Édith Piaf died the day before but that was announced on the morning of Cocteau's day of death; it has been said that his heart failed upon hearing of Piaf's death. According to his wishes Cocteau is buried beneath the floor of the Chapelle Saint-Blaise des Simples in Milly-la-Forêt. The epitaph on his gravestone set in the floor of the chapel reads: "I stay with you" ("Je reste avec vous").