Tens of thousands of people have joined rallies in Greece ahead of talks in Brussels on the new leftist government's bid to revise its massive bailout.
Supporters also gathered in several European capitals on the eve of the meeting of eurozone finance ministers to join Greece in calling for a radical revision of the Europe's austerity policies.
The rally outside the parliament in Athens drew about 20,000 people, police said on Sunday.
About 8000 also thronged the streets in Thessaloniki, Greece's second biggest city in the north of the country, calling on Brussels to loosen the noose of austerity.
Greece is hoping to renegotiate its mammoth 240 billion euros ($A353.38 billion) bailout, but its overtures to international creditors have so far fallen on deaf ears, with paymaster Germany unwilling to reverse its policy on austerity.
Athens risks being forced out of the eurozone if a deal is not found by the end of the month.
In Paris, about 2000 people walked through the city centre in a show of solidarity against what organisers called "the Goliath of finance".
Marchers unfurled flags from the hard-left Syriza party of their new prime minister and chanted: "In Greece, in France, resistance against austerity and finance."
In Lisbon about 300 people took to the streets with banners reading "Greece, Spain, Portugal, our battle is international".
Close to 100 people also rallied in Madrid.
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