Source: http://vgsitaliansig.org/linguistics/languages-italy/
Timestamp: 2019-04-22 16:16:45+00:00

Document:
The primary language of Italy is Italian.
(Legge 15 Dicembre 1999, n. 482, Art. 2, comma 1). The law also makes a distinction between those who are considered minority groups (Albanians, Catalans, Germanic peoples indigenous to Italy (“popolazioni germaniche”), Greeks, Slovenes and Croats)and those who are not (all the others).
Aosta Valley: French is co-official (enjoying the same dignity and standing of Italian) in the whole region (Le Statut spécial de la Vallée d’Aoste, Title VIe, Article 38); German is unofficial but recognised in the Lys Valley (Lystal) (Le Statut spécial de la Vallée d’Aoste, Title VIe, Art. 40 – bis).
Friuli-Venezia Giulia: the Friulian and Slovene language are “promoted”, but not recognised, by the region (Legge regionale 18 dicembre 2007, n. 29, Art. 1, comma 1); (Legge regionale 16 novembre 2007, n. 26, Art. 16).
Piedmont: the Piedmontese language is unofficial but recognised as the regional language (Consiglio Regionale del Piemonte, Ordine del Giorno n. 1118, Presentato il 30/11/1999); the region “promotes”, without recognising, the Occitan, Franco-Provençal and Walser languages (Legge regionale 10 aprile 1990, n. 26, Art. 3, comma 1 bis).
Sardinia: Sardinian is co-official, enjoying the same dignity and standing of Italian (Legge regionale 15 ottobre 1997, n. 26). The Sassarese and Gallurese dialects are “promoted” in their respective territories, as well as Catalan in the city of Alghero and Tabarchino in the islands of Sulcis.
Trentino-Alto Adige/Südtirol: German is co-official (enjoying the same dignity and standing of Italian) in the province of South Tyrol (Statuto speciale per il Trentino-Alto Adige, Titolo XI, Articolo 99);[Ladin, Cimbrian and Mocheno are unofficial but recognised in their respective territories (Statuto speciale per il Trentino-Alto Adige, Titolo XI, Articolo 102).
Veneto: Venetian is unofficial but recognised (Legge regionale 13 aprile 2007, n. 8, Art. 2, comma 2).

References: Art. 2
 Art. 40
 Art. 1
 Art. 16
 Art. 3
 Art. 2