They moved from their normal home in a nearby park in Nairobi and threatened to cause havoc.
So staff at the president's official residence called in Kenyan wildlife experts to help remove the 35 monkeys.
One expert said: "Once a few monkeys found out that food was available at the State House they went back to the park and invited all their friends."
Now most of the uninvited guests have been returned to the park.
And staff at the president's house are asking local people not to feed them in an attempt to keep them away.