A 38-year-old volunteer firefighter was killed by a falling electricity pole in a suburb of the capital. Greece's prime minister says a heatwave has turned the country into a powder keg, BBC reports.
Firefighters are battling 154 wildfires across the country.
"We are facing another, more difficult night," said government minister Nikos Hardalias. "Wildfires of unprecedented intensity and spread, all our forces are fighting the battle day and night to save lives, together with volunteers."
Thousands of people have been ordered to leave their homes outside Athens as the blaze tore through houses, cars, and businesses.
The firefighter was among the first two people killed by the fires.
The other victim was the president of the Athens Chamber of Commerce, Konstantinos Michalos. He was found unconscious in a factory close to where a fire was raging.
A further 20 people have been injured.
Hundreds of residents and tourists on Evia island have been evacuated aboard ferries and fishing boats, as wildfires closed in on its shores.
Earlier, Ukraine sent its rescuers to Greece to help eliminate large-scale forest fires. "Ukraine is always ready to help and support our partners. We wish Greece to curb the destructive element as soon as possible," PM stated.