Jens Erik Fenstad

Jens Erik Fenstad (born 15 April 1935) is a Norwegian mathematician.

He graduated as mag.scient. from the University of Oslo in 1959, and worked as a research fellow there and at Berkeley. He was a professor at the University of Oslo from 1968 to 2003, except for the years 1989 to 1993, when he was vice rector (prorektor). On May 29, 1998 Fensted received an honorary doctorate from the Faculty of Science and Technology at Uppsala University, Sweden.

He has chaired the Norwegian Mathematical Society and the World Commission on Ethics (COMEST) of the UNESCO, and co-founded the Abel Prize. He has also edited the journal Nordisk Matematisk Tidsskrift. He is a member of the Norwegian Academy of Science and Letters.

He resides at Østerås.