The 1998 Norwegian Football Cup was the 93rd edition of the Norwegian Football Cup and was won by Stabæk after defeating Rosenborg in the final at Ullevaal Stadion on 1 November.
Because of Norway's participation in the 1998 FIFA World Cup, the clubs playing in Tippeligaen entered the competition in the third round.
Below are the dates for each round as given by the official schedule:
|colspan="3" style="background-color:#97DEFF"|21 April 1998
|- |colspan="3" style="background-color:#97DEFF"|22 April 1998
|- |colspan="3" style="background-color:#97DEFF"|23 April 1998
|colspan="3" style="background-color:#97DEFF"|13 May 1998
|colspan="3" style="background-color:#97DEFF"|3 June 1998
|- |colspan="3" style="background-color:#97DEFF"|4 June 1998