Ontario (disambiguation)

Ontario may refer to:

Places

• the province of Ontario in Canada
• Ontario County, Ontario, the name of several historic counties
• Ontario, California, USA
• Ontario, New York, USA
• Ontario, Ohio, USA
• Ontario, Oregon, USA
• Ontario, Wisconsin, USA
• Ontario County, New York, USA

Lakes

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

Other

• the American naval vessel USS Ontario.
• Ontario International Airport (ONT) in Ontario, California
• Ontario Motor Speedway, a 2.5-mile racetrack in Ontario, California
• a number of computer viruses:
  • Ontario.512
  • Ontario.1024
  • Ontario.2048