Léon Chertok or Lejb Tchertok (31 October 1911 in Vilnius, Vilna Governorate – 6 July 1991 in Deauville), was a French psychiatrist known for his work on hypnosis and psychosomatic medicine.
In 1947 he worked in a psychiatric ward at Mount Sinai Hospital in New York, in a psychosomatic unit directed by the psychoanalyst Lawrence Kubie.
The end of the 1970s and the 1980s was marked by his exchanges with philosophers such as François Roustang, Mikkel Borch-Jacobsen, Michel Henry and Isabelle Stengers.
Chertok found that the psychoanalysts neglected the practice and phenomenon of hypnosis, and thus made himself an object of fierce criticism from their side.
He underwent, as mentioned, analysis with Jacques Lacan, and was a student of Francis Pasche, but he was not accepted as a member of the Societe Psychanalytique de Paris.