Frontenac may refer to:
People
- Louis de Buade de Frontenac, Governor of New France
Places
Canada
Quebec
- Château Frontenac, hotel in Quebec City
- Frontenac, Quebec
- Frontenac County, Quebec
- Frontenac (Montreal Metro), Montreal Metro station
- Frontenac National Park (Parc national de Frontenac)
- Frontenac (provincial electoral district), Quebec provincial electoral district
- Frontenac (Quebec federal electoral district), former federal electoral district
- Frontenac (1912–1973 provincial electoral district), former Quebec provincial electoral district
- Frontenac Lake (Milieu River), Lac-Ashuapmushuan, RCM Le Domaine-du-Roy, Saguenay-Lac-Saint-Jean
Ontario
- Fort Frontenac, French fort and trading post located in what is now Kingston, Ontario
- Frontenac County:
- Township of Central Frontenac
- Township of Frontenac Islands
- Township of North Frontenac
- Township of South Frontenac
- Frontenac Provincial Park, a provincial park near Kingston, Ontario
- Frontenac Public School, Burlington, Ontario
- Frontenac Secondary School, Kingston, Ontario
- Frontenac (Ontario electoral district), former federal electoral district
- Frontenac (Ontario provincial electoral district), former provincial electoral district
France
United States
Automotive
- Abendroth & Root Manufacturing Co, produced automobiles under the name Frontenac 1906-1913
- Frontenac Motor Corporation, a joint racing-car venture of Louis and Gaston Chevrolet 1916-1921
- Dominion Motors Frontenac, a division of Durant Motors that built and sold automobiles in Canada 1931-1933
- Frontenac (marque), an automobile introduced in 1960 by Ford Motor Company of Canada
Others
- Frontenac (grape)
- Frontenac Axis, a geological feature in Canada and the United States
- Lac Frontenac or Lac de Frontenac, an old name for Lake Ontario
- PS Frontenac, first paddle steamer launched on the Great Lakes
- McColl-Frontanac Oil Company, a Canadian company acquired by Texaco in 1956
- Frontenac: or The Atotarho of the Iroquois, a poem by Alfred Billings Street
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