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- Mlado Radić, Bosnian Serb, sentenced to 20 years for Omarska camp
- Erich Raeder (1876–1960), German grand admiral, sentenced to life imprisonment, later released
- Friedrich Rainer (1903–1947?), German Gauleiter and an Austrian Landeshauptmann of Salzburg and Carinthia, sentenced to death
- Ivica Rajić (born 1958), Bosnian Croat sentenced to 12 years
- Taha Yassin Ramadan (1938–2007), Iraqi Vice President, 1991–2003, sentenced to life imprisonment, appealed to death
- Hanns Albin Rauter (died 1949), German Higher SS and Police Leader in Holland, sentenced to death
- Hermann Reinecke (1888–1973), German OKW official, sentenced to life imprisonment, later released
- Hans Conrad Julius Reiter (1881–1969), German SS officer and involved in medical experiments at the Buchenwald concentration camp, sentenced
- Lothar Rendulic (1887–1971), German commander of 52nd Infantry Division, sentenced to 20 years (later 10)
- Joachim von Ribbentrop (1893–1946), German foreign minister, sentenced to death
- Henrick Rogstad (died 1945), Norwegian collaborator and SS security police chief
- Karl von Roques (died 1949), German Rear Area Army Group South commander
- Alfred Ernst Rosenberg (1893–1946), German east minister, sentenced to death
- Abdullah Kadhem Ruaid, (?) Iraqi Baathist official, sentenced to 15 years
- Mizhar Abdullah Ruaid, (1949–present) Iraqi Baathist official, sentenced to 15 years
Read more about this topic: List Of Convicted War Criminals