The Revierderby is the name given to any association football match between two clubs in the Ruhr region – also known in German as the Revier, a contraction of Bergbaurevier – in North Rhine-Westphalia, but in most cases it refers to the derby between two most historically successful clubs from the region: Borussia Dortmund and FC Schalke 04. Outside Germany, it is often referred to as the Ruhr derby.

The Ruhr, also referred to as the Ruhr area, sometimes Ruhr district, Ruhr region, or Ruhr valley, is a polycentric urban area in North Rhine-Westphalia, Germany. With a population density of 2,800/km2 and a population of over 5 million (2017), it is the largest urban area in Germany. It consists of several large cities bordered by the rivers Ruhr to the south, Rhine to the west, and Lippe to the north. In the southwest it borders the Bergisches Land. It is considered part of the larger Rhine-Ruhr metropolitan region of more than 10 million people, which is the third largest in Western Europe, behind only London and Paris.