Greeks are voting in an election expected to bring in a government led by the left-wing Syriza party.
The party has promised to take on international lenders and roll back painful austerity measures imposed during years of economic crisis.
Barring a huge upset, victory for Syriza, which has led opinion polls for months, would produce the first government in the eurozone openly committed to cancelling the austerity terms of its EU and IMF-backed bailout programme.
Al Jazeera's Sue Turton reports from Athens.
