Guide to camping in Ontario: Database srearch engine of parks and campgrounds in Ontario. (Database has over 4,000 parks and campgrounds listed in Canada.)
Ontario Private Campground Association: OPCA has a searchable database of campgrounds, camping tips, links and other useful resources.
Ontarioguide - Camping: A guide with links, to the most popular camping sites in Ontario.
Wilderness Adventurers of Ontario: An outdoors club involved in canoeing, camping, hiking, kayaking, and cross-country skiing.