Piedmontese (English: PEED-mon-TEEZ; autonym: piemontèis [pjemʊŋˈtɛjz] or lenga piemontèisa; Italian: piemontese) is a language spoken by some 2,000,000 people mostly in Piedmont, a region of Northwest Italy. Although considered by most linguists a separate language, in Italy it is often mistakenly regarded as an Italian dialect. It is linguistically included in the Gallo-Italic languages group of Northern Italy (with Lombard, Emilian, Ligurian and Romagnolo), which would make it part of the wider western group of Romance languages, which also includes French, Occitan, and Catalan. It is spoken in the core of Piedmont, in northwestern Liguria, near Savona and in Lombardy (some municipalities in the westernmost part of Lomellina near Pavia).

It has some support from the Piedmont regional government but is considered a dialect rather than a separate language by the Italian central government.

Due to the Italian diaspora Piedmontese has spread in the Argentinian Pampas, where many immigrants from Piedmont settled. The Piedmontese language is also spoken in some states of Brazil, along with the Venetian language.