The Stoddard-Dayton automobile brand, produced in the United States from 1905 to 1913, was a pioneering luxury car manufacturer based in Dayton, Ohio. Known for high-quality engineering and precision manufacturing, Stoddard-Dayton built powerful, well-appointed touring cars and runabouts that combined robust four-cylinder engines with advanced chassis design. The marque gained international recognition for reliability and performance, including participation in early automobile racing and endurance events. In 1913, the company became part of the United States Motor Company, and its engineering legacy influenced subsequent automotive developments. Stoddard-Dayton holds a respected place in early American automotive history.