Nynorsk (pronounced [ˈnyːnɔʂk]), Neo Norwegian or New Norwegian is one of two official written standards for the Norwegian language, the other being Bokmål. The standard language was created by Ivar Aasen during the mid-19th century, to provide a Norwegian alternative to the Danish language which was commonly written in Norway at the time.

27% of the Norwegian municipalities have declared Nynorsk as their official language form, and these comprise about 12% of the Norwegian population. Nynorsk is the majority form of the four counties Rogaland, Hordaland, Sogn og Fjordane and Møre og Romsdal, which together comprise the region of Western Norway.

The Norwegian Language Council recommends the name Norwegian Nynorsk when referring to this language in English.

Spoken Norwegian, Swedish and Danish form a continuum of mutually intelligible dialects and sociolects. Nynorsk is the smallest of the four major standard languages within this broad speech community alongside Norwegian Bokmål, Swedish and Danish. Nynorsk standard language is nevertheless used in broadcasting, on stage, and by a few individuals. Bokmål has a much larger basis in the middle-class urban speech, especially that found in the eastern part of Southern Norway. However, most Norwegians do not speak this so-called Standard Østnorsk, but Norwegian dialects. The western and other traditional Norwegian dialects are the spoken basis for Nynorsk, and many Nynorsk supporters regard them as the standard way to speak Nynorsk, even if the majority of dialect speakers use Bokmål in writing. As such, Nynorsk is not a minority language^{[citation needed]}, though it shares many of the problems that minority languages face.