The Adler was a German automobile produced from 1900 to 1940. Adler is the German word for eagle.

The Adler factory produced bicycles, typewriters, and motorcycles in addition to cars. Before the World War I, the company used De Dion two- and four-cylinder engines in cars that ranged from 1032 cc to 9081 cc; beginning in 1902, they used their own engines as well. These cars, driven by Erwin Kleyer and his brother Otto (sons of the company founder, Heinrich Kleyer ) and by Alfred Theves won many sporting events. In the 1920s, Karl Irion raced many Adlers; popular models of the period included the 2298 cc, 1550 cc, and 4700 four-cylinders and the 2580 cc six-cylinders. Many of the Standard models, built between 1927 and 1934, featured Gropius and Neuss coachwork. These had 2916 cc six-cylinder engines and 3887 cc eight-cylinder engines. Later in the decade the company introduced front-wheel drive Trumpf and Trumpf-Junior models, ranging from 995 cc to 164 5cc four-cylinder sv engines. These gained many successes in races, including in the Le Mans race. The 1943 cc Favorit, the 2916 cc six-cylinder Diplomat (featuring 65 hp (48 kW) at 3800 rpm, and the 1910 cc four-cylinder and 2494 cc six-cylinder models (with Ambi-Budd and Karmann bodywork ) were all rear-driven ; these were built until the World War II. After the war the company concentrated on building motorcycles.