This list of rivers and streams in Ostwestfalen-Lippe contains a selection of the rivers, streams and lakes which lie wholly or partly in Ostwestfalen-Lippe (OWL). The rivers are organised based on the Weser, Lippe and Ems river systems. In addition they are sometimes further divided into sub-regions. The list does not contain all named rivers in OWL, but at least all those with a total catchment area of 10 square kilometres. The list of lakes is also not a full list of all named lakes, especially as the distinction with ponds is not always clear.