The US state department has ordered the departure of non-emergency employees from Iraq.
This comes amid rising tensions between the US and Iraq's neighbour Iran.
Staff at the embassy in Baghdad and the consulate in Irbil must leave as soon as possible on commercial transport.
Meanwhile, the German and Dutch armies have suspended training Iraqi soldiers.
The US military on Wednesday said the threat level in the Middle East had been raised in response to intelligence about Iran-backed forces in the region.
It contradicted a British general who had said there was no increased threat.