The title of this article is ambiguous. For the revolutionary restructuring attempt of the German Confederation, see German Empire 1848/1849.

German Reich was the name of the German nation-state between 1871 and 1945. Initially not congruent, the name also became the constitutional designation of Germany. After the "Anschluss" of Austria in March 1938, the name "Greater German Reich" came into propagandistic and official use. A Fuehrer decree in June 1943 instructed the institutions of the state to use this designation in the future.

The term German Empire is also occasionally used to refer to the Holy Roman Empire (962-1806): a supranational, ultimately supranational ruling entity that had been given the suffix "German Nation" from the 15th/16th century onwards.

In 1848, during the March Revolution, a "German Empire" was created as a German federal state. Its imperial government and thus the provisional constitution were recognized by the Bundestag of the German Confederation. In the spring of 1849, however, the Prussian King Frederick William IV had the revolution put down, and the elaborated constitution could not prevail.

In the German Empire of the 19th and 20th centuries, one generally distinguishes between several periods: the monarchy of the German Empire (1871-1918), the pluralistic, semi-presidential democracy of the Weimar Republic (1918/19-1933), and the dictatorship of the Nazi state during the period of National Socialism (1933 to 1945). In the following transitional period of occupied Germany until 1949, the term had already largely fallen into disuse. In the initially disputed question of whether the German Reich had continued to exist after 1945, from the end of the 1940s and finally with the decision of the Federal Constitutional Court of 31 July 1973, the thesis prevailed that the German Reich had survived the collapse of 1945. The Federal Republic was not its "legal successor", but was rather identical as a state with the state "German Reich"; with regard to the spatial extent, the old Federal Republic of Germany was "partly identical" (teilkongruent) until 1990. From the formula of spatial partial identity it followed: "The GDR belongs to Germany" (BVerfGE 36, 17), but not to the Federal Republic.