The Audi RS4  is the top tier and highest performing version of the Audi A4 range of cars. It is a sports-focused compact executive car, produced by Quattro GmbH, in limited numbers, for German car manufacturer AUDI AG, part of the larger Volkswagen Group. It slots distinctly above the Audi S4 as the fastest, most sports-focused model based on the A4's "B" chassis.

New dimensions in driving dynamics combined with innovative ideas and concepts - and, in addition, exciting lines and a level of equipment living up to even the highest luxury performance standards: The new Audi RS 4 combines the latest high-performance motoring qualities offered by Quattro GmbH in a thoroughbred sports saloon with supreme everyday driving qualities in the premium segment. Indeed, the new RS 4 is the top-of-the-range model in the A4 series, a development all-new from the ground up.