Germany's lower house of parliament has approved the country's contribution to a 750bn euro ($938bn, £651bn) rescue deal for the eurozone.
The upper house is also expected to back a German contribution of up to 148bn euros.
Chancellor Angela Merkel has faced widespread domestic opposition to her support for measures to help Greece and other struggling EU economies.
But she has warned that the euro would be "in danger" without strong action.
The Bundestag, or German lower house, voted by 319 votes to 73 in favour of Germany's participation in the bail-out, with 195 abstentions.
Two opposition parties abstained and one voted against.
The BBC's Steve Rosenberg in Berlin says it was hardly a convincing victory for Mrs Merkel, who has come under attack at home and abroad for her handling of the financial crisis.
Without cross-party support the German leader will struggle to secure public backing for bailing out Germany's neighbours, he says.
Bail-out plans for Greece are already thought to have contributed to a defeat for her centre-right coalition in a key state election in North Rhine-Westphalia (NRW) earlier this month. >>>
