Georg Fredrik Rieber-Mohn (born 13 August 1945) is a Norwegian judge.
He was born in Lillehammer, and graduated as cand.jur.
from the University of Oslo in 1969.He worked as a secretary from 1969, and as a prison administrator from 1971.
In 1974 he was hired in the Ministry of Justice and the Police as a researcher.
After a period as auxiliary judge from 1975 to 1976 and district attorney from 1976 to 1980, both in Stavanger, he returned to the Ministry of Justice in 1980 as deputy under-secretary of State.
In 1985 he left to be a presiding judge in Eidsivating.
In 1986 he was appointed as Norwegian Director of Public Prosecutions, as the youngest to date.
From 1997 to 2007 he served as a Supreme Court Justice.
After this he returned to the Ministry of Justice.
In 2011 Rieber-Mohn became chairman (styreleder) of the Fritt Ord Foundation.
Previously he was the deputy leader of the foundation.