From November 9, 2020, all foreign nationals travelling to Norway from red countries must present a certificate of a negative COVID-19 test when they arrive in Norway.
The test must have been taken less than 72 hours before entry. If the person does not present such a test, he or she may be refused entry.
The requirement will not apply to Norwegians, persons who reside in Norway or persons in transit.
Please read more here: https://www.regjeringen.no/en/aktuelt/stay-at-home-have-as-little-social-contact-as-possible/