Water-bombing helicopters are dousing the flames near Istiaia, at the island's northern tip. Ukraine, Romania and Serbia sent help to the fire zone.
Evia is just north of Athens, where fires on the northern outskirts are now less intense.
Besides Greece, there are also big wildfires in Italy, Algeria and Russia.
Thousands of people have been evacuated from villages in Greece, which is also getting firefighting help from some other EU countries, Switzerland and the UK.
