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
- Ford Frontenac, a model introduced in 1960 by Ford Motor Company of Canada
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