Ontario (disambiguation)

Ontario is a province in east-central Canada.

Ontario may also refer ro:

Belize

 * Ontario, Belize, a village in Cayo District, Belize

Canada

 * Ontario County, Ontario, the name of several historic counties
 * Ontario (federal electoral district), a defunct federal electoral district
 * Ontario (provincial electoral district), a defunct provincial electoral district
 * Ecclesiastical Province of Ontario, an Anglican province

United States

 * Ontario, California
 * Ontario, Illinois
 * Ontario, Indiana
 * Ontario, Iowa
 * Ontario, New York
 * Ontario (CDP), New York
 * Ontario County, New York
 * Ontario, Ohio
 * Ontario, Oregon
 * Ontario, Wisconsin
 * Ontario Township (disambiguation)

Lakes

 * Lake Ontario, one of the Great Lakes on the boundary between the Canadian province of Ontario and the U.S. state of New York
 * Ontario Lacus, a dark feature near the south pole of Saturn's moon Titan

Ships

 * HMCS Ontario, several Canadian naval vessels
 * HMCS Ontario (C53)
 * HMS Ontario, several British naval vessels
 * HMS Ontario (1780), British warship sunk during the American Revolution
 * USS Ontario, several American naval vessels

Other uses

 * Ontario (computer virus)
 * Ontario (processor), a computer APU from AMD
 * Ontario International Airport (ONT) in Ontario, California
 * Ontario Motor Speedway, a 2.5-mile racetrack in Ontario, California
 * 45554 Ontario, a British LMS Jubilee Class locomotive
 * Ontario Bus Industries, the former name of Canadian bus manufacturer Orion Bus Industries