Since 1990, the 'Tag der Deutschen Einheit' has been a national holiday in Germany. It is the only official national holiday. All other holidays are managed at a federal level. The reunification of Germany took place on 3 October 1990, when the former German Democratic Republic (GDR) was incorporated into the Federal Republic of Germany (FRG). Following the GDR's first free elections on 18 March 1990, negotiations between the GDR and FRG culminated in a Unification Treaty.

Further negotiations between the GDR and FRG and the four occupying powers produced the so-called "Two Plus Four Treaty" granting full sovereignty to a unified German state, whose two halves had previously been bound by a number of limitations as a result of its post-WWII-status as an occupied nation. The German Unification Day has been celebrated in the capital of whichever federal state has got the chair in the Federal Assembly (there are 16 federal states in Germany).

German Unification Day wasn't added as an additional holiday. In the west, it replaced the original Day of German Unity, which an anniversary of a protest on 17 June 1953 in East Germany. In East Germany, the national holiday was 7 October, the Day of the Republic (Tag der Republik), which commemorated the foundation of the GDR in 1949.

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