Cheers for the veganaparis.com site, very handy.
The list supplied in the link above should put you on the right track. I just wanted to add that if you speak French you could also go to a traditional restaurant and tell the waiter nicely that you don't eat meat/fish/eggs /dairy and ask if they could prepare you something. They're usually extra nice.
LOL I officially live in France (am never here) and my experience so far is that people look at you with disbelief if you simply say your vegetarian. Trying to explain to them that you don't eat any animal products sends them into a state of shock. They just all love their foie gras too much to understand.