Mechtild of Nassau

Mechtild of Nassau (before 1280–1323) was the youngest daughter of Adolf, King of the Romans, and Imagina of Isenburg-Limburg. In 1294 she married Rudolf I of Bavaria, the Wittelsbach duke who became Count Palatine of the Rhine.

After Rudolf's death in 1319 and the long feud with his brother, Emperor Louis IV, her sons Rudolf II and Rupert I and her grandson Rupert II received the Palatinate under the Treaty of Pavia in 1329. She died at Heidelberg in 1323.