The Grand Duke Jean Museum of Modern Art, abbreviated to Mudam, is a museum of modern art in Luxembourg City, in southern Luxembourg. The museum stands on the site of the old Fort Thüngen, on the southwestern edge of the Kirchberg-plateau, in close proximity to many of the European Union institutions based within the city.

Luxembourg, also known as Luxembourg City, is the capital city of Luxembourg and the country's most populous commune. Standing at the confluence of the Alzette and Pétrusse rivers in southern Luxembourg, the city lies at the heart of Western Europe, situated 213 km (132 mi) by road from Brussels, 372 km (231 mi) from Paris, and 209 km (130 mi) from Cologne. The city contains Luxembourg Castle, established by the Franks in the Early Middle Ages, around which a settlement developed.