Hans Waldemar Ruin was a Finland-Swedish philosopher and writer. He was professor of philosophy at Åbo Akademi University 1945–1947 and associate professor of aesthetics at Lund University 1947–1952, where he was then research associate professor 1952–1957. He was also associate professor of psychology at the University of Helsinki 1927–1936 and of art and literature psychology 1936–1949.
- Occupation
- philosopher, writer, psychologist, aesthetician
- Citizenship
- Sweden, Finland, Grand Duchy of Finland
- Born
- 1891, June 18, 1891
- Died
- 1980, November 3, 1980
