A show car, sometimes called a dream car, is a custom-made automobile created specifically for public display, rather than sale. They are shown at auto shows and other exhibitions.

Show cars generally fall into one or more of three categories:

• Cars intended to preview an upcoming new production model or redesigned model, either to assess or to whet the public appetite. Such preview show cars may be thinly disguised or slightly retrimmed versions of the eventual production model, painted in bold or unusual colors or fitted with unusual trim to attract attention.
• Cars intended to assess the public reaction to a type of model, or a particular styling theme or feature. A prominent example was the 1938 Buick Y-Job, a custom-built Buick created by General Motors styling chief Harley Earl for his own use; although it was never produced, it contained features such as hidden headlights that later became GM styling features. Such cars typically are not intended for production themselves, but may become the basis of a production model if demand is high enough. The Dodge Viper is notable example of the latter.
• Styling exercises built to reward successful designers, letting them blow off steam with a design more exciting than workaday, "cooking" sedans and trucks. Such exercises also serve to draw attention to the manufacturer's more ordinary products.
• Alternatively, it could mean privately owned cars that have been extensively cared for by their owners for the purpose of entering car shows.