Viktor Freiherr von Weizsäcker (21 April 1886, in Stuttgart – 9 January 1957, in Heidelberg) was a German physician and physiologist.
He studied at Tübingen, Freiburg, Berlin, and Heidelberg, where he earned his medical degree in 1910.
In 1920, he became head of the neurological department at Ludolf von Krehl's clinic in Heidelberg.
In the late 1920s, Weizsäcker was co-editor of Die Kreatur with philosopher Martin Buber (1878-1965) and theologian Joseph Wittig (1879-1949).
In 1956, he published Pathosophie, where he tried to create a philosophical understanding of man through his drives, conflicts, and illnesses.