The National Archives of Norway (Arkivverket) manages the state archives and has many regional archives and digital archive collections available online. Use this link to find opening hours for the various archives.

DigitalArkivet – National Archives of Norway Online Records

The National Archives and the State Archives in Oslo / Regional Archives of Oslo – covers regional and local archives from Oslo and the former counties of Akershus and Østfold: 

Online Akershus Genealogy Records at DigitalArkiv – Norway

Online Østfold Genealogy Records at DigitalArkivet – Norway

State Archives in Hamar / Regional Archives of Hamar – covers the former counties of Hedmark and Oppland

Online Hedmark Genealogy Records at DigitalArkivet – Norway

Online Oppland Genealogy Records at DigitalArkivet – Norway

State Archives in Kongsberg / Regional Archives of Kongsberg – covers the former counties of Buskerud, Vestfold, and Telemark

Online Buskerud Genealogy Records at DigitalArkivet – Norway

Online Vestfold Genealogy Records at DigitalArkivet – Norway

Online Telemark Genealogy Records at DigitalArkivet – Norway

State Archives in Kristiansand / Regional Archives of Kristiansand – covers Agder county

State Archives in Stavanger / Regional Archives of Stavanger – covers Rogaland county

Online Rogaland Genealogy Records at DigitalArkivet – Norway

State Archives in Bergen / Regional Archives of Bergen – covers former counties of:

Hordaland

Sogn og Fjordane

State Archives in Trondheim / Regional Archives of Trondheim – covers the counties of Møre and Romsdal, Trøndelag, and Nordland

Online Møre og Romsdal Genealogy Records at DigitalArkivet – Norway

Online Nordland Genealogy Records at DigitalArkivet – Norway

Online Nord-Trøndelag Genealogy Records at DigitalArkivet – Norway

State Archives in Tromsø / Regional Archives of Tromsø – covers Troms, Finnmark, and Svalbard

Sámi Archive / State Archives in Sámi / Regional Archives of Sámi 

Norwegian Health Archives

The Libraries in the National Archives