Johan Teunis Barendregt (16 February 1924 – 2 January 1982) was a Dutch psychologist and chess International Master (IM) (1962).

Barendregt studied psychology at the University of Amsterdam with Adriaan de Groot and investigated the effectiveness of psychoanalysis, among other things.

He had the ambition to force psychology in the direction of natural science and, according to his contemporaries, delivered a methodologically exemplary dissertation, covering only 53 pages.

In retrospect by Jaap van Heerden, Barendregt is called 'a walking paradox', because he became the personification of the method struggle that was going on at the time between the hermeneutics of psychoanalysts and psychotherapists, and the methodological approach of experimental psychologists and psychometricians.

[5] He is mentioned in My 60 Memorable Games (1969) by Bobby Fischer in connection with the Ruy Lopez Exchange Variation, a line in which he made important theoretical contributions.