the province of Ontario in Canada

Ontario, California, USA

Lake Ontario is one of the Great Lakes on the boundary between the province of Ontario and the U.S. state of New York.

Ontario International Airport (ONT) in Ontario, California

Ontario, Oregon, USA

Ontario County, New York, USA

Ontario, Ohio, USA

Ontario Motor Speedway, a 2.5-mile racetrack in Ontario, California

Ontario, New York, USA

Ontario County, Ontario, the name of several historic counties

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Ontario, Wisconsin, USA

The Canadian naval vessel HMCS Ontario (C53)

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the American naval vessel USS Ontario.