Alternative History
Großherzogtum Luxemburg
Grand Duchy of Luxemburg
State of the Holy Roman Empire (963–1806)
State of the Confederation of the Rhine
State of the German Confederation
State of the German Empire

Flag Coat of arms
Mir wölle bleiwe wat mir sin
"We want to remain what we are"
Ons Heemecht
The Luxemburg (red) within the German Empire, after World War I
Capital Luxembourg City
Official language German
Religion Roman Catholic
Government Constitutional monarchy
Grand Duke
 - 1815–1840 Guillaume I
 - 1964–1989 Jean
 - 1848 G.T.I. de la Fontaine
 - 1989 Jacques Santer
Legislature Abgeordnetenkammer
Historical era Napoleonic Wars, New Imperialism, World War I, Interwar period, World War II, Cold War
 - Independence from France 9 June 1815
 - German occupation 1 August 1914
 - Secession from Germany 28 September 1989

The Grand Duchy of Luxemburg (German: Großherzogtum Luxemburg) was established after the defeat of Napoleon in 1815, Luxemburg was disputed between Prussia and the Netherlands. The Congress of Vienna formed Luxembourg as a Grand Duchy within the German Confederation in personal union with the Netherlands, being at the same time a part of the Netherlands and ruled as one of its provinces, with a Confederate fortress manned by Prussian troops. This situation was revised by the 1839 First Treaty of London, from which date Luxembourg's full independence is reckoned. During World War I, Luxemburg was invaded and occupied by Germany, but was allowed to maintain its independence and political mechanisms until after the war. After the war the Grand Duchy was officially annexed by Germany as a full member state of the Reich.