All North Germanic languages are descended from Old Norse.
Divisions between subfamilies of North Germanic are rarely precisely defined: Most form continuous clines, with adjacent dialects being mutually intelligible and the most separated ones not.

Old Norse
West Scandinavian
Faroese
Greenlandic Norse (extinct)
Icelandic
Norn (extinct)
Norwegian
Nordnorsk (Northern Norway)
Bodø dialect (Bodø)
Brønnøy dialect (Brønnøy)
Helgeland dialect (Helgeland)
other dialects
Trøndersk (Trøndelag)
Fosen dialect (Fosen)
Härjedal dialect (Härjedalen)
Jämtland dialects (Jämtland province) (Wide linguistic similarity with the Trøndersk dialects in Norway)
Meldal dialect (Meldal)
Tydal dialect (Tydal)
other dialects
Vestlandsk (Western and Southern Norway)
West (Vestlandet)
Bergen dialect (Bergen)
Haugesund dialect (Haugesund)
Jærsk dialect (Jæren district)
Karmøy dialect (Karmøy)
Nordmøre dialects (Nordmøre)
Sunndalsøra dialect (Sunndalsøra)
Romsdal dialect (Romsdal)
Sandnes dialect (Sandnes)
Sogn dialect (Sogn district)
Sunnmøre dialect (Sunnmøre)
Stavanger dialect (Stavanger)
Strilar dialect (Midhordland district)
South (Sørlandet)
Arendal dialect (Arendal region)
Valle-Setesdalsk dialect (Upper Setesdal, Valle)
other dialects
Østlandsk (Eastern Norway)
Flatbygd dialects (Lowland districts)
Vikværsk dialects (Viken district)
Andebu dialect (Andebu)
Bohuslän dialect (Bohuslän province) (Influenced by Swedish in retrospective)
Grenland dialect (Grenland district)
Oslo dialect (Oslo)
Midtøstland dialects (Mid-east districts)
Ringerike dialects (Ringerike district)
Hønefoss dialect (Hønefoss)
Ådal dialect (Ådal)
Oppland dialect (Opplandene district)
Hedmark dialects (Hedmark)
Solung dialect (Solør)
Hadeland dialect (Hadeland district)
Østerdal dialect (Viken district)
Särna-Idre dialect (Särna and Idre)
Midland dialects (Midland districts)
Gudbrandsdal dialect (Gudbrandsdalen, Oppland and Upper Folldal, Hedmark)
Hallingdal-Valdres dialects (Hallingdal, Valdres)
Hallingdal dialect
Valdris dialect (Valdres district)
Telemark-Numedal dialects (Telemark and Numedal)
Bø dialect
other dialects
Dalecarlian (Dalarna), including Elfdalian (which is considered a separate language from Swedish, Älvdalen locality)
East Scandinavian
Danish
Insular Danish (Ømål)
East Danish (Bornholmsk along with former East Danish dialects in Blekinge, Halland and Skåne (Scanian dialect) as well as the southern parts of Småland, now generally considered South Swedish dialects)
Jutlandic (or Jutish, in Jutland)
Northern Jutlandic
East Jutlandic
West Jutlandic
Southern Jutlandic (in Southern Jutland and Southern Schleswig)
Urban East Norwegian (generally considered a Norwegian dialect)
Swedish
Sveamål (Svealand)
Norrland dialects (Norrland, including Westrobothnian and Kalix)
Götamål (Götaland)
Swedish dialects in Ostrobothnia (Finland and Estonia)
Gutnish (Gotland)
other dialects
All North Germanic languages are descended from Old Norse. Divisions between subfamilies of North Germanic are rarely precisely defined: Most form continuous clines, with adjacent dialects being mutually intelligible and the most separated ones not.
Old Norse
West Scandinavian
Faroese
Greenlandic Norse (extinct)
Icelandic
Norn (extinct)
Norwegian
Nordnorsk (Northern Norway)
Bodø dialect (Bodø)
Brønnøy dialect (Brønnøy)
Helgeland dialect (Helgeland)
other dialects
Trøndersk (Trøndelag)
Fosen dialect (Fosen)
Härjedal dialect (Härjedalen)
Jämtland dialects (Jämtland province) (Wide linguistic similarity with the Trøndersk dialects in Norway)
Meldal dialect (Meldal)
Tydal dialect (Tydal)
other dialects
Vestlandsk (Western and Southern Norway)
West (Vestlandet)
Bergen dialect (Bergen)
Haugesund dialect (Haugesund)
Jærsk dialect (Jæren district)
Karmøy dialect (Karmøy)
Nordmøre dialects (Nordmøre)
Sunndalsøra dialect (Sunndalsøra)
Romsdal dialect (Romsdal)
Sandnes dialect (Sandnes)
Sogn dialect (Sogn district)
Sunnmøre dialect (Sunnmøre)
Stavanger dialect (Stavanger)
Strilar dialect (Midhordland district)
South (Sørlandet)
Arendal dialect (Arendal region)
Valle-Setesdalsk dialect (Upper Setesdal, Valle)
other dialects
Østlandsk (Eastern Norway)
Flatbygd dialects (Lowland districts)
Vikværsk dialects (Viken district)
Andebu dialect (Andebu)
Bohuslän dialect (Bohuslän province) (Influenced by Swedish in retrospective)
Grenland dialect (Grenland district)
Oslo dialect (Oslo)
Midtøstland dialects (Mid-east districts)
Ringerike dialects (Ringerike district)
Hønefoss dialect (Hønefoss)
Ådal dialect (Ådal)
Oppland dialect (Opplandene district)
Hedmark dialects (Hedmark)
Solung dialect (Solør)
Hadeland dialect (Hadeland district)
Østerdal dialect (Viken district)
Särna-Idre dialect (Särna and Idre)
Midland dialects (Midland districts)
Gudbrandsdal dialect (Gudbrandsdalen, Oppland and Upper Folldal, Hedmark)
Hallingdal-Valdres dialects (Hallingdal, Valdres)
Hallingdal dialect
Valdris dialect (Valdres district)
Telemark-Numedal dialects (Telemark and Numedal)
Bø dialect
other dialects
Dalecarlian (Dalarna), including Elfdalian (which is considered a separate language from Swedish, Älvdalen locality)
East Scandinavian
Danish
Insular Danish (Ømål)
East Danish (Bornholmsk along with former East Danish dialects in Blekinge, Halland and Skåne (Scanian dialect) as well as the southern parts of Småland, now generally considered South Swedish dialects)
Jutlandic (or Jutish, in Jutland)
Northern Jutlandic
East Jutlandic
West Jutlandic
Southern Jutlandic (in Southern Jutland and Southern Schleswig)
Urban East Norwegian (generally considered a Norwegian dialect)
Swedish
Sveamål (Svealand)
Norrland dialects (Norrland, including Westrobothnian and Kalix)
Götamål (Götaland)
Swedish dialects in Ostrobothnia (Finland and Estonia)
Gutnish (Gotland)
other dialects
North Germanic languages