The currency zone's largest economies will come to a standstill or shrink, it said in its latest economic outlook, with Germany, France and Italy not growing at all at 0.0%.
Ireland and Spain will see output fall and jobless lines and government deficits swell, the EU executive said.
Among EU members that don't use the euro, Britain's economy will slip into recession with minus 1% growth, while Baltic states Estonia and Latvia will also see negative growth.
The 27-member EU warned that things may get even worse as forecasters could not rule out a deeper credit crunch that would brake the economy, strain government finances and put a near-freeze on household spending.
Even slightly higher costs for borrowing -- an extra risk premium of 0.5% on interest rates - would tighten credit available to households and could "trigger an outright recession, a decline of 1% of GDP in the euro area," it said.
The labor market should deteriorate sharply next year, it said, with unemployment in the euro-zone climbing to 8.4% in 2009 from a decade-low of 7% at the end of 2007.
Spain will see the worst of this as a housing bubble bursts and tourism slows. The jobless rate may shoot up to 15.5% in 2010 from 10.8% this year, the EU says.
EU economists said the outlook for the euro area and the wider 27-nation European Union "remains bleak" with growth contracting this winter before recovering gradually toward the end of next year as exports start to pick up.
It says the euro area likely shrank in the third quarter of 2008 and may grow 1.2% for the entire year, 0.1% next year and 0.9% in 2010. It forecast EU gross domestic product this year at 1.4% , falling to 0.2% in 2009 and 1.1% in 2010.
The only silver lining it picks out is a slide in inflation, down from record highs to an average of 2.2% next year as oil prices cool swiftly. This may increase the amount of money people have to spend but they may be less likely to shop if they fear job losses. Private consumption is nearly stagnant, it says.
Oil prices should fall from a 2008 average of $104 a barrel to $86 next year, it says. But food and metal prices will probably stay at high levels.
The cost of bailing out troubled banks while tax revenues shrink and welfare payouts swell will see governments pile on debt and run bigger deficits, the EU executive warns.
It says France and Ireland will break EU budget rules in 2009 by running a yearly government deficit of more than 3% of GDP. The ceiling is intended to keep their shared currency stable. Britain, Latvia, Lithuania, Romania and Hungary will also likely exceed the limit.
Economy gets big stimulus boost
Jobless claims dim recovery hopes
Stocks dive, oil soars on wobbly Wall Street
Dollar hits 12-month high
