Ontario (andre betydninger)

Ontario kan være:

Byer i USA
 Ontario (Illinois)
 Ontario (Indiana)
 Ontario (Iowa)
 Ontario (California)
 Ontario (Kansas)
 Ontario (New York)
 Ontario (Ohio)
 Ontario (Oklahoma)
 Ontario (Oregon)
 Ontario (Pennsylvania)
 Ontario (Virginia)
 Ontario (Wisconsin) 
 Ontario Beach (New York)
 Ontario Center (New York)
 Ontario Heights (Oregon)
 Ontario on the Lake (New York)