The Diplomat was a car sold by the German automaker Adler from 1934 to 1938, and replaced the previous Standard 6 and Standard 8 models. It contrasted from its predecessors by being built with a low bed frame.

Two variants of the vehicle existed: a "long" version, sold as a four-door saloon and two-door convertible, and a "short" version, which was only offered as a four-door "Pullman" saloon. In 1935, both variants were redesigned, featuring reshaped grilles and fenders that were similar in appearance to those of the concurrent Primus and Trumpf models. Until 1938, 3205 examples of both versions were produced.


The first Diplomats were fitted with 2916cc four-stroke six-cylinder standing-valve engines capable of generating 60 bhp (44 kW) of output. Due to being smaller than their "long" counterparts, the "short" vehicles were capable of reaching speeds of up to 105 km/h, whereas a "long" example could expect speeds up to 100 km/h. "Short" Diplomats weighed approximately 1480 kg, measured 4750 mm long, 1740 mm wide, and 1650 mm high, and rode on a wheelbase of 3200 mm. Their "long" counterparts" were slightly larger, weighing an even 1500 kg, measuring 4900 mm long, and riding on a wheelbase of 3350 mm.


Redesigned variants of the Diplomat were manufactured between 1935 and 1938. They featured the same engines as the first cars, but could now generate 60-65 bhp (44-48 kW) of output. A "short" example weighed 1665 kg and measured 4900 mm long, 1740 mm wide, and 1650 mm high, while a "long" variant weighed about 1710 kg and measured 5050 mm long.