Signe Gaupset and Frida Maanum both scored twice as Norway survived a late Iceland fightback to extend their 100% winning start at Euro 2025.
SK Brann's 20-year-old forward Gaupset, one of six changes made by coach Gemma Grainger, assisted both of Maanum's goals after scoring a double of her own.
There was nothing at stake at Stockhorn Arena, with Norway having already qualified for the quarter-finals as group winners while Iceland had already been eliminated from the tournament after defeats in their opening two games.
Iceland were on top when they took the lead and scored their first goal of the tournament through Sveindis Jonsdottir, who reacted quickest to a loose ball from a corner and fired past Cecilie Fiskerstrand from close range.
Their lead lasted just nine minutes as Norway grew into the game and scored from a set-piece of their own, this time Gaupset volleying in from Vilde Boe Risa's corner.
Gaupset scored her second 11 minutes later after collecting the ball on the turn before running at goal and unleashing a fierce strike into the bottom corner.
She then turned provider for Maanum after the break, playing a one-two with the Arsenal forward, who clinically finished from inside the box.
The pair linked up again as Maanum made a driving run forward from Gaupset's ball and scored Norway's fourth from the edge of the box with 14 minutes left.
Iceland gave Norway a nervy end to the game with two late goals.
Substitute Hlin Eiriksdottir scored in the 84th minute before Glodis Viggosdottir converted a penalty awarded by the video assistant referee in injury time after Marit Lund's shirt pull on Eiriksdottir, for which the Norway defender received a second yellow card.
Despite a spirited end to the game, Iceland could not find a way back to register their first point in Switzerland.