The city of Luxembourg (Lëtzebuerg, Luxemburg), also known as Luxembourg City (Stad Lëtzebuerg, Ville de Luxembourg, Luxemburg Stadt), is a commune with city status, and the capital of the Grand Duchy of Luxembourg. It is located at the confluence of the Alzette and Pétrusse rivers in southern Luxembourg and contains the historic Luxembourg Castle, established by the Franks in the Early Middle Ages, about which the area grew up.

As of 2005, the commune of Luxembourg City has a population of 76,420, which is almost three times the population of the second most populous commune. The city's metropolitan population, including that of surrounding communes of Hesperange, Sandweiler, Strassen, and Walferdange, is 103,973. Luxembourg City lies at the heart of Western Europe, situated 188 km (117 miles) from Brussels, 289 km (179 miles) from Paris, 190 km (118 miles) from Cologne.

Luxembourg City is one of the wealthiest cities in the world, having developed into a banking and administrative centre. Luxembourg is a seat of several institutions of the European Union, including the European Court of Justice, the European Court of Auditors, and the European Investment Bank.