Just got back from a trip there. There are so many options. Very close to U of Ottawa are:
Perfection, Satisfaciton, Promise: I love it, have always eaten well there. Just check with them to make sure what is vegan. http://www.perfectionsatisfactionpromise.ca/
Freshi: there is one at 50 Laurier
Govindas: haven't been but it's close by too.
Then on rideau st by King Edward (on the way to Aunti Loos) are a few Ethiopian Restaurants and near Aunti Loos is Flavours of the Caribbean which I never made it to, but is supposed to be Veg friendly.
There are lots of restaurants and take out in the Byward market area. Another cafe I like similar to Perfection is Peace Garden at 47 Clarence, inside the building. Check with them about what is vegan. We really enjoyed vegetarian pho at http://phobynight.com/
on dalhousie st.
There is also a health food store on York st (http://www.marketorganics.ca/
) where I believe you can get some take out.
Couple of places with reviews/maps http://www.happycow.net/north_america/c ... io/ottawa/http://www.punkottawa.com/aroundottawa/ ... ndex.shtmlhttp://ncva.ca/veg-businesses/text-version/