thumb|The map shows the division of the Norwegian dialects within the main groups.
Norwegian dialects () are commonly divided into four main groups, 'Northern Norwegian' (), 'Central Norwegian' (), 'Western Norwegian' (), and 'Eastern Norwegian' (). Sometimes 'Midland Norwegian' () and/or 'South Norwegian' () are considered fifth or sixth groups.
The dialects are generally mutually intelligible, but differ significantly with regard to accent, grammar, syntax, and vocabulary. If not accustomed to a particular dialect, even a native Norwegian speaker may have difficulty understanding it. Dialects can be as local as farm clusters, but many linguists note an ongoing regionalization, diminishing, or even elimination of local variations.
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! rowspan=2 | Old Norse
! Modern Norwegian
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! Setesdal
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