The Steyr Austria (21/100 PS) is a car of made by Steyr-Werke as their top model in 1929. It was first show in October at the Paris Motor Show.

The car was designed by Ferdinand Porsche at the beginning of 1929. Only three prototypes were made due to the merger between Steyr-Werke and Austro-Daimler Puchwerke Ltd. The Austria would have competed with Austro-Daimler Puchwerke Ltd's current model so the Austria was dropped.

The car had an 5295cc 8-cylinder overhead valve engine installed. A four-speed manual gearbox (3 speed + overdrive) was fitted and power was sent to the rear wheels. The engine produced 100hp and the cars top speed was 75mph (120kmh).

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