Ribbentrop, Joachim vonRib‧ben‧trop, Jo‧a‧chim von /ˈrɪbəntrɒp $ -trɑːp, ˈjəʊəkɪm vɒn $ -vɑːn/(1893–1946) a German Nazi official who became Hitler's foreign minister and advised him on foreign policy. After World War II Ribbentrop was found guilty of war crimes, and was hanged.