The Austro-Daimler ADM II is a passenger car of the middle class which was produced by Austro-Daimler as a supplement to the larger model AD 6-17. The car was introduced in 1923 and was designed by Ferdinand Porsche. The engine was made out of a light-alloy block.

The car had a front mounted 2.3 litre 6-cylinder in-line engine that powered the rear wheels via a 4-speed gearbox. The front wheels were attached to a rigid axle that had longitudinal leaf-springs. The rear wheels were also mounted on a rigid axle, this had cantilever springs. In contrast to the models of AD 6-17 and ADV, the car was equipped with a flat radiator. All four wheels were fitted with brakes.

In 1924 the ADM II was replaced with the newer 10/45 hp. This had a slightly larger engine than the 10/40 hp. It was produced until 1927.

In 1926, a sports car with an engine with a capacity of 3 litres appeared. It was named the Austro-Daimler ADM 3 Litre. This model was built until 1928, being available as a 2  and a 4-seater.

In 6 years, a total of about 500 cars of all the ADM models were produced. The successor was the ADR.