The Ravensberg Basin () or Ravensberg Hills () is a natural region in the governorate of Detmold () in the northeastern part of the German state of North Rhine-Westphalia; small elements also fall within the neighbouring state of Lower Saxony. It is part of the lower Weser Uplands and comprises low rolling hills bordered by the ranges of the Wiehen Hills in the north, Lippe Uplands in the east, Teutoburg Forest in the south and Osnabrück Hills in the west. The heart of the Ravensberg Basin is almost coincident with the cultural region of the Ravensberg Land.