Ioannis Rallis (Greek: Ιωάννης Δ. Ράλλης; 1878 – 26 October 1946) was the third and last collaborationist prime minister of Greece during the Axis occupation of Greece during World War II, holding office from 7 April 1943 to 12 October 1944, succeeding Konstantinos Logothetopoulos in the Nazi-controlled Greek puppet government in Athens.

Parliament was fractured, with the Liberal Party under Themistoklis Sophoulis having a one-seat majority and the opposition divided between monarchists and Communists and every philosophy in between.

Being more experienced in politics than his predecessors, a general and a German-speaking doctor, he was more respected by the Germans and proved more effective against the resistance movements.

Thus, they all failed to prevent the Nazis from imposing heavy "reconstruction" fees on Greece, paid eventually by the confiscation of crops and precipitating a terrible famine that according to the Red Cross, cost the lives of about 250,000 people (mainly in the urban areas of the country).

In 1947, Georgios published a book entitled Ioannis Rallis Speaks from the Grave, which consisted of a remorseful text written by his father during his imprisonment.