The Steyr XII was a car made by Steyr between 1925 and 1929.

The car was developed and designed by Anton Honsig. The car was first shown in October 1925 at the Olympia Show in London. It introduced and pushed its modern design and its efficiency with great interest.

The car had a front-mounted 1568cc six-cylinder engine that powered by a 4-speed manual gearbox, the rear wheels. Front wheels were mounted on rigid axle and longitudinal leaf springs had. The rear swing axle had a transverse leaf spring. The car produced 30hp and the top speed was 53mph (85kmh).

Until 1929 the vehicle was called the 6/30 PS.

A total of 11,124 cars were produced the 4 years of production.

The successor appeared in 1929 and was the larger Steyr XX.