Ontario (disambiguation)

There is more than one place called Ontario:

North America

 * Lake Ontario - One of the Great Lakes, shared by the U.S. and Canada.

Canada

 * Ontario - A province of Canada.

United States of America

 * Ontario (California) - A city outside of Los Angeles in the state of California.
 * Ontario County - A county in the Finger Lakes region of New York.
 * Ontario (New York) - a small town in Wayne County in the Finger Lakes region of New York.
 * Ontario (Oregon) - a town in Oregon.