"The greatest threat in the Middle East and to countries in the world is US intervention," he told a press conference after a summit of the "D8" group of developing nations.
"The military bases in the whole world should be eradicated and removed," he said.
"To build confidence in the region is to have fundamental change in the next US government," the Iranian leader added.
Ahmadinejad, who is embroiled in a wrangle over Iran's nuclear enrichment programme, called on the major powers to "withdraw from animosity and hostile actions against us".
"Justice, peace and friendship is also in their benefit," he said.
"To rebuild confidence, the US must withdraw its forces from Iraq and allow the fate of the people of Iraq and regional countries to be written by the hands of their own people," he said.
