HMCS Ontario
Template:Use Canadian English Template:Italic title prefixed
HMCS Ontario can refer to several ships:
- Template:HMS, a sixth-rate warship of the Provincial Marine (of then British North American Province of Quebec) and operated by the Royal Navy in Lake Ontario; sunk 1780
- Template:HMCS, a Template:Sclass cruiser transferred to the Royal Canadian Navy in 1944 and scrapped in 1960
- HMCS Ontario, a Royal Canadian Sea Cadet summer training centre in Kingston, Ontario established in 1977 as Cadets Camp Frontenac and now based at CFB Kingston/Royal Military College of Canada
- HMCS Ontario was a planned nuclear-powered Template:Sclass2 cancelled in 1989