Born between 1 January 1951 and 30 June 1961
If you were born between 1 January 1951 and 30 June 1961, you became Norwegian at birth provided that your father was Norwegian and also married to your mother when you were born. If only your father was Norwegian and your parents married after you were born, but before you reached the age of 18, you became Norwegian from the point in time your parents became married.
Alternatively, you became Norwegian at birth if your mother was Norwegian, but not married, when you were born. If your mother was Norwegian, married and you did not acquire citizenship from your father when you were born, then you still became Norwegian at birth provided you were born in Norway.
Documentation
You must have a birth certificate and be able to document that at least one of your parents was Norwegian when you were born.
If your father or both your parents were Norwegian you must submit your parents’ marriage certificate (applies whether they were married when you were born or if they married before you reached the age of 18).
If only your mother was Norwegian you must submit documentation that shows that your parents were not married when you were born.
Applicable law
"The Norwegian Nationality Act of 8 December 1950".