Italy

Italy was a country in Europe before the Great War.

Background
During World War II, Italy fought on the side of the Axis Powers.

Fallout
The Romans and their penchant for war are mentioned in the intro to the game.

Fallout 2
Flick from the Den speaks several Italian words and phrases.

Fallout 3
In Point Lookout, the pre-War Colontoni's Pizzeria bears an Italian flag on the building (the flag has inverted colors).

Fallout: New Vegas

 * Caesar's Legion, a major organization in the southwestern United States, based their culture and society on the ancient Roman Empire, an old Italic civilization, and its leader based on Gaius Julius Caesar. The city of Rome and the Rubicon river are also referenced. The historic European region known as Gaul is mentioned as well, which encompassed parts of Northern Italy.
 * Benny often uses ciao as a parting phrase.

Fallout 4

 * Eddie Winter mentions attempting to further Irish/Italian relations in Boston before the war.
 * In Vault-Tec Workshop, the Sicilian espresso machine refers to the island of Sicily.

Fallout 76

 * The pre-War restaurants Little Italy and Graviano's Italian Eatery are Italian-themed diners, the former having a picture of Rome's Colosseum on its logo.
 * The pre-War proprietor of Miller's Appliances at the Watoga Shopping Plaza managed to increase sales by programming his Mister Handy vendors to refer to all appliances in Italian.
 * In Wild Appalachia, the Pioneer Scout archaeologist exam contains questions about the history of Pompeii and Sicily.

Fallout Tactics
The Beretta 470 Silverhawk is of Italian origin.

Fallout: Brotherhood of Steel

 * The 9mm M9FS Beretta was manufactured by the Italian Fabbrica d'Armi Pietro Beretta firearms company.
 * The SPAS-12 was manufactured by the Italian Luigi Franchi società per azioni company.

Appearances
Italy is mentioned in Fallout, Fallout 2, Fallout 3 and its add-on Point Lookout, Fallout: New Vegas, Fallout 4 and its add-on Vault-Tec Workshop, Fallout 76 and its update Wild Appalachia, Fallout Tactics, Fallout Shelter, and Fallout: Brotherhood of Steel.