Anton Trstenjak (8 January 1906 – 29 September 1996) was Slovene psychologist, theologian, and author.

He is notable as a pioneer of Slovenian clinical psychology and was practicing his own logotherapy-inspired psychotherapy.

[1] Anton Trstenjak was born into a family of small farmers in Rodmošci near Gornja Radgona, at the time part of Austrian Empire, now Slovenia.

He went to study further in Paris between 1935 and 1937, and then to Milan, where he specialized in experimental psychology at Agostino Gemelli between 1941 and 1942.

[1] From 1940 until his retirement in 1973, he taught psychology and philosophy at the Roman Catholic Faculty of Theology in Ljubljana.