About 6,000 policemen will be deployed in the capital for her 6-hour visit, turning the city centre into a no-go zone for protest marches planned by labour unions and opposition parties.
"We don't want her here," said Yannis Georgiou, 72, who has seen his pension cut by one third. "We will take to the streets against austerity and against the government. Maybe Merkel will hear something and see what we're going through."
Merkel's visit is a sign of Germany's support for the coalition government of Prime Minister Antonis Samaras as it struggles to agree new budget cuts with international lenders, overcome the objections of reluctant coalition partners and cope with rising public anger.