The Norwegian Football Cup (Norwegian: Norgesmesterskapet i fotball for herrer) is the main knockout cup competition in Norwegian football. It is run by the Football Association of Norway and has been contested since 1902, making it the oldest football tournament in the country. The tournament is commonly known as Cupen ("The Cup") , NM or NM Cup (NM Cupen), an acronym formed from Norgesmesterskap ("Norwegian Championship"). These terms are used to describe both the men's and women's competitions. The equivalent competition for women's teams is the Norwegian Women's Football Cup.

The Norwegian Football Cup is a national championship, meaning that while the Eliteserien may be the most prestigious competition to win, it is the winners of the Cup who are awarded the title "Norwegian football champions". This differs from, for example, English football, where the winners of the Premier League are the ones who become English champions.

Winners receive the King's trophy. Winners also qualify for the Europa Conference League second qualifying round and a place in the Mesterfinalen, the Norwegian super cup match. The current Norwegian champions and holders of the cup are Viking, who defeated Haugesund 1–0 in the 2019 final. Odd and Rosenborg are the most successful clubs with 12 titles each.