Acadia was an early American automobile brand established by Ernest R. Kelly in Wilmington, Delaware, during the years 1903 to 1904. The brand is notable for its simple two-seater runabout, which featured a 5-horsepower single-cylinder engine located beneath the seat and utilized a single-chain drive system. The vehicle was designed with wheel steering and included a Renauk-style bonnet.

Despite Kelly's efforts to market the Acadia, which he priced at $600 (with additional costs for wings, lights, and a horn), he never formally established a company. As a result, it is believed that possibly only one Acadia vehicle was ever produced, making it a rare example of early automotive history.