The original Plymouth Duster is a semi-fastback two-door coupe version of the compact-sized Plymouth Valiant automobile that was marketed by Plymouth in the U.S. from 1970 to 1976 model years.

Plymouth was a brand of automobiles produced by Chrysler Corporation and its successor DaimlerChrysler. The brand was launched in 1928 to compete in what was then described as the "low-priced" market segment that was dominated by Chevrolet and Ford. It became a high-volume seller for the automaker until the late 1990s. Plymouth cars were marketed primarily in the United States. The brand was withdrawn from the marketplace in 2001. The Plymouth models that were produced up to then were either discontinued or rebranded as Chrysler or Dodge.