Traugott Konstantin Oesterreich

Traugott Konstantin Oesterreich (15 September 1880, in Stettin (Szczecin) – 28 July 1949, in Tübingen) was a German religious psychologist and philosopher. Professor at the university of Tübingen.

Oesterreich was also interested in parapsychology. He argued against the philosophy of materialism.

He was the author of Die Besessenheit (1921), a book on demonic possession. It was translated into English in 1966. William Peter Blatty, author of The Exorcist, was influenced by the book.