Firefighters struggle to contain blazes that have burned thousands of hectares.
One resident of a nearby village told a Greek television station: “We’re going to burn alive here.”
About 40 villages had been evacuated in the Peloponnese and on Euboea by early on Sunday.
State of emergency
The Greek government has declared a state of emergency as more than 1,000 firefighters, backed by 425 soldiers and 16 water-dropping aircraft, battled the flames.
Nicole Itano, reporting from the capital Athens, said the announcement of a state of emergency was highly unusual in Greece.
“The state of emergency will give them more power to requisition private property and force evacuations,” she said.
There were fears that the death toll would rise as emergency services searched devastated areas.
The government has said it suspects that many of the deadly fires were started deliberately.
Firefighters hoped they would be able to get some control over the blazes on Sunday as strong winds, which have fanned the flames, subsided.
Four Canadair water-bombers and some 60 French firefighters were expected to join the fight, along with an Italian aircraft.