The Regional State Archives in Trondheim[1] (Norwegian: Statsarkivet i Trondheim) is a regional division of the National Archival Services of Norway and is the national archive for Møre og Romsdal, Sør-Trøndelag, Nord-Trøndelag and Nordland.
More information on the Wikipedia page [1].
The website, in Norwegian is [2] and English is [3].