The House of Saxe-Lauenburg was a German noble family that originated in the 12th century. It was part of the larger House of Saxe and played a significant role in the politics of northern Germany. The family ruled over the Duchy of Saxe-Lauenburg, which was located in present-day Schleswig-Holstein and Lower Saxony. Throughout its history, the House of Saxe-Lauenburg experienced various territorial changes and dynastic unions. It became notable for its connections to other royal families in Europe, including marriages into the House of Habsburg and the House of Oldenburg. The family's influence waned in the 17th century, leading to its eventual extinction in the male line.