Haagen Krog Steffens (30 April 1873 – 9 May 1917) was a Norwegian historian, archivist and genealogist.
[1] Haagen Krog Steffens was born in Christiania (now Oslo), Norway.
He was the son of physician Henrich Steffens (1841-1984) and Asta Falch.
Both his father and grandfather were doctors and his family fostered a number of prominent individuals.
Later he undertook a series of studies at archives in Sweden, Denmark, Germany and Belgium.