The Rhine-Neckar Metropolitan Region, often referred to as Rhein-Neckar-Triangle, is a polycentric metropolitan region located in south western Germany, between the Frankfurt/Rhine-Main region to the North and the Stuttgart Region to the South-East.

There are eleven metropolitan regions in Germany consisting of the country's most densely populated cities and their catchment areas. They represent Germany's political, commercial and cultural centres. The eleven metropolitan regions in Germany were organised into political units for planning purposes.