Rudolf Rahn (16 March 1900 – 7 January 1975) was a German diplomat who served the Weimar Republic and Nazi Germany.
As a member of the Party, and as Plenipotentiary to the Italian Social Republic in the closing stages of the Second World War, he was arrested and held at Nuremberg as a potential war criminal, but he was released in 1949 and deemed to be denazified in Class V (exonerated).