Godfrey I of Leuven (c. 1060 – 25 January 1139), Duke of Lower Lotharingia, Landgrave of Brabant, Count of Brussels and Leuven, also known as Godfrey the Bearded, was a nobleman in what is now Belgium and the Netherlands. As Duke of Lower Lotharingia, he is usually named Godfrey VI.

Godfrey was the son of Henry II of Leuven and a countess called Adela (origin unknown). Godfrey was accorded the Duchy of Lower Lotharingia in 1106 by the German Emperor, despite rival claims from the House of Limburg. He was deposed by the King of Germany Lothair III in 1129, but nevertheless maintained the title.