Fritz Rehn (3 August 1874 – 18 September 1934) was a German lawyer and the first Judge-President of the Nazi People's Court.
In 1905 he was appointed to the court in Bochum and in 1913 he moved to Koblenz.
In 1920, he became a Regional Director and he moved to Berlin in 1933 to become chairman of the newly instituted Special Court on the District Court of Berlin.
With the opening of the People's Court on 1 July 1934 he was elected the Judge-President and he presided over its first sessions, but a few weeks after his appointment he died of a gall-bladder disease at only 60 years of age.
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