The Fulham striker continued his red-hot form in front of goal to add a second for his side – his 12th goal in his last 11 games for club and country – after Dusan Vlahovic had given them the lead in Oslo.
Norway’s own star man Erling Braut Haaland was kept quiet at the other end as his scoring streak came to an end at the worst possible time for his country, who surrender top spot and promotion at the final hurdle.
Serbia went into the final match of the campaign knowing that only a win would be enough to leapfrog their hosts, and despite the presence of in-form Haaland on the opposition, their own strikeforce stole the show.
Vlahovic broke the deadline three minutes before half time to put Serbia in command and shift the onus onto Norway, but Stale Solbakken’s side had no answer.
Instead, it was the visitors who got the all-important next goal, and it was a landmark one for Mitrovic as he became the first Serbian player to score 50 goals for his country, doing so in just his 76th appearance.
It was a telling contribution which also saw Mitrovic move level with Haaland as the top scorer in the 2022-23 Nations League with six goals – an award they will now share – while his tally of 14 goals overall in the Nations League is a new record.