The Pader is a river in North Rhine-Westphalia, Germany, left tributary of the Lippe. It runs through the city of Paderborn, which it gave its name. Although fairly wide, it is only 4 kilometres (2.5 mi) in length which makes it the shortest river this size of Germany.^[1]

The Pader receives its water from six source rivers, each resulting from a karstic spring in the centre of Paderborn: the Maspernpader, the Dielenpader, the Rothobornpader, the Börnepader, the Dammpader and the Warme Pader.

• List of rivers of North Rhine-Westphalia