Wilhelm Stekel (German: [ˈʃteːkəl]; March 18, 1868 – June 25, 1940) was an Austrian physician and psychologist, who became one of Sigmund Freud's earliest followers, and was once described as "Freud's most distinguished pupil." According to Ernest Jones, "Stekel may be accorded the honour, together with Freud, of having founded the first psycho-analytic society"; while he also described him as "a naturally gifted psychologist with an unusual flair for detecting repressed material." He later had a falling-out with Freud, who announced in November 1912 that "Stekel is going his own way". His works are translated and published in many languages.
Born in Boiany, Bukovina, he wrote a book called Auto-erotism: A Psychiatric Study of Onanism and Neurosis, first published in English in 1950. He is also credited with coining the term paraphilia to replace perversion. He analysed, among others, the psychoanalysts Otto Gross and A. S. Neill, as well as Freud's first biographer, Fritz Wittels. The latter paid tribute to "his strange ease in understanding", but commented that "The trouble with Stekel's analysis was that it almost invariably reached an impasse when the so-called negative transference grew stronger". His autobiography was published in 1950.