Giselbert of Luxembourg (c. 1007 – 14 August 1059) was Count of Salm and of Longwy, then Count of Luxemburg from 1047 to 1059. He was a son of Frederick of Luxembourg,Pit Péporté (2011). Constructing the Middle Ages: Historiography, Collective Memory and Nation-Building in Luxembourg. BRILL. count of Moselgau, and perhaps of Ermentrude of Gleiberg.
At first count of Salm and of Longwy, on his brother Henry II's death he inherited the County of Luxembourg,Luxembourg Doing Business for Everyone Guide – Practical Information and Contacts. p. 39. as well as providing the income for the abbeys of Saint-Maximin in Trier and Saint-Willibrord in Echternach. He got into an argument with the Archbishop of Trier Poppon as to the abbaye Saint-Maximin, which was arbitrated by his brother Adalbero III, bishop of Metz.
In 1050, since the population of the town of Luxembourg had risen considerably, he expanded the city by building a new fortified wall around it.
By an unknown wife, he had: Conrad I, Count of LuxembourgGades, John A. (1951). Luxembourg in the Middle Ages. Brill. († 1086) Hermann of Salm († 1088), count of Salm, founder of the House of Salm daughter, married Thierry of Amensleben daughter, married Kuno, count of Oltingen Adalbéron († 1097 at Antioch), canon at Metz Jutta, married Udo of Limbourg Rudolph, abbot of Altmünster Abbey
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