Knut Erik Tranøy (December 10, 1918 – March 19, 2012) was a Norwegian philosopher.
During World War II Tranøy, along with 700 other Norwegian students, was deported to the Buchenwald concentration camp in Germany. He was appointed professor at the University of Bergen from 1959, and at the University of Oslo from 1978. His main contributions have been in fields of ethics, particularly in medicine and science. He is a member of the Norwegian Academy of Science and Letters from 1979. He was decorated as Knight, First Class of the Royal Norwegian Order of St. Olav in 2002.
- Tysklandsstudentene (1946) (co-authored with Michael Sars)
- On the Logic of Normative Systems (1953, thesis)
- The Moral Import of Science. Essays on Normative Theory, Scientific Activity and Wittgenstein (1998)