Berthold Grünfeld (22 January 1932 – 20 August 2007) was a Norwegian psychiatrist, sexologist, and professor of social medicine at the University of Oslo.

He was also a recognized expert in forensic psychiatry, often employed by Norwegian courts to examine insanity defense pleas.

During the occupation of Norway, Grünfeld avoided capture and deportation by fleeing with members of the Norwegian Resistance in 1942 to neutral Sweden, where he stayed until the war ended.

In addition to his advocacy and teaching, he acted as an expert witness in criminal cases, and as a consultant on human relations and sexology for Oslo Helseråd.

In 2005, his daughter Nina Grünfeld made a film, Origin Unknown, about her efforts to research her father's background and heritage.