Germany

Germany was a country before the Great War.

Fallout/2

 * In the game's intro, Hitler and his reinvigoration of the German economy are mentioned.
 * The PPK12 Gauss pistol, Vindicator minigun, and M72 Gauss rifle are described as German designs.

Fallout 76

 * German settlers came to the town of Helvetia in the 1800s, bringing with them the holiday of Fasnacht. Various references to the country exist in the town, as well a painting with the phrase "home is where the heart is" written in German.
 * Germany is an incorrect answer to two questions in the exams at the Pioneer Scout camp.

Appearances
Germany is referenced in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4, Fallout 76 and Fallout Shelter.

Behind the scenes

 * The country would have been referenced in canceled games Fallout: Brotherhood of Steel 2, Van Buren, and Fallout Pen and Paper d20.
 * The city of Dusseldorf is mentioned in Wixon's Shovel Museum, which is a real world location in Germany.
 * The city of Kronach is mentioned as the hometown of Vault-Tec scientist Stanislaus Braun, which is a real world location in Germany.
 * Joshua Sawyer stated that the language of the Dead Horses tribe was created with parts of the German language.
 * The real world Reichstag building is depicted in the Fallout intro.