The F9 was a prototype passenger car built by DKW before the advent of World War II, and was intended to be the successor of the DKW F8.

The plans for the F8's successor may have been devised as early as 1937. It was intended to be a front-wheel drive car with a three-cylinder two-stroke petrol engine. Industrial designer Günther Mickwausch was responsible for designing the sheet metal bodywork of the F9. Before World War II, 20 functional prototypes were built; however, priorities of German industries then shifted to defense in 1939, and production of the F9 had to come to a halt. The F9 project was never restored, but similarly-designed DKW F89s and F91s were introduced after World War II ended.