Romansh (also spelled Romansch, Rumantsch, or Romanche; Romansh:  rumantsch , rumàntsch,  romauntsch  or  romontsch ) is a Romance language spoken predominantly in the southeastern Swiss canton of Grisons (Graubünden), where it has official status alongside German and Italian and is used as the medium of instruction in schools in Romansh-speaking areas. Romansh has also been recognized as a national language of Switzerland since 1938 and as an official language along with German, French and Italian since 1996. It is sometimes grouped with Ladin and Friulian as a Rhaeto-Romance language, though this is disputed.

Romansh is a descendant of the spoken Latin language of the Roman Empire, which by the 5th century AD replaced the Celtic and Raetic languages previously spoken in the area, although Romansh retains a small number of words from these languages. Romansh has also been heavily influenced by German in vocabulary and morphosyntax. The language gradually retreated to its current area over the centuries, being replaced by Alemannic and Bavarian dialects. The earliest writing identified as Romansh dates from the 10th or 11th century, although major works do not appear until the 16th century when several regional written varieties began to develop. The 19th century saw a further shrinkage of the language area but also a literary revival and the start of a language movement dedicated to halting the decline of the language.