Jean Laplanche (laplɑ̃ʃ; 21 June 1924 – 6 May 2012) was a French author, psychoanalyst and winemaker. Laplanche is best known for his work on psychosexual development and Sigmund Freud's seduction theory, and wrote more than a dozen books on psychoanalytic theory. The journal Radical Philosophy described him as "the most original and philosophically informed psychoanalytic theorist of his day."
From 1988 to his death, Laplanche was the scientific director of the German to French translation of Freud's complete works (Oeuvres Complètes de Freud / Psychanalyse – OCF.P) in the Presses Universitaires de France, in association with André Bourguignon, Pierre Cotet and François Robert.
Laplanche grew up in the Côte d'Or region of France. In his adolescence he was active in Catholic Action, a left-wing social justice organization. Laplanche attended the École Normale Supérieure in the 1940s, studying philosophy. He was a student of Jean Hyppolite, Gaston Bachelard and Maurice Merleau-Ponty. In 1943, during the Vichy regime, Laplanche joined the French Resistance, and was active in Paris and Bourgogne. In 1946–47, he visited Harvard University for a year. Instead of joining that university's philosophy department, he instead studied at the Department of Social Relations, and became interested in psychoanalytic theory. After returning to France, Laplanche began attending lectures and undergoing psychoanalytic treatment under Jacques Lacan. Laplanche, advised by Lacan, began studying medicine, and eventually earned his doctorate and became an analyst himself, joining the International Psychoanalytical Association, of which he remained a member until his death.
Laplanche continued his political activity. In 1948, Laplanche was one of the founding members of the organization Socialisme ou Barbarie (Socialism or Barbarism) after breaking with Trotskyism, but notes that the group's "atmosphere soon became impossible", due to the influence of Cornelius Castoriadis, who "exerted hegemony over the journal.