The Lombard language belongs to the Gallo-Italic group within the Romance languages and is characterized by a Celtic linguistic substratum and a Lombardic linguistic superstratum and is a cluster of homogeneous dialects that are spoken by millions of speakers in Northern Italy and southern Switzerland, including most of Lombardy and some areas of the neighbouring regions, notably the far eastern side of Piedmont and the extreme western side of Trentino, and in Switzerland in the cantons of Ticino and Graubünden. The language is also spoken in Santa Catarina in Brazil by Lombard immigrants from the Province of Bergamo, in Italy.

Lombardic or Langobardic is an extinct West Germanic language that was spoken by the Lombards, the Germanic people who settled in Italy in the sixth century. It was already declining by the seventh century because the invaders quickly adopted the Latin vernacular spoken by the local population. Lombardic may have been in use in scattered areas until as late as c. 1000 AD. Many toponyms in modern Lombardy and Greater Lombardy and items of Lombard and broader Gallo-Italic vocabulary derive from Lombardic.