Henry III, Count of Luxembourg was count of Luxembourg (1086-1096), in succession to his father Conrad. His mother was Clementia of Aquitaine. Henry III was the first count known to have established his permanent residence in Luxembourg castle. In a document from the year 1089, he is referred to as comes Henricus de Lutzeleburg, which also makes him the first documented count of Luxembourg.
He never married and was succeeded by his brother William.