| 1978 Norwegian Football Cup | |
| Other Titles: | Norgesmesterskapet i fotball for menn 1978 |
| Country: |  Norway |
| Num Teams: | 128 (main competition) |
| Defending Champions: | Lillestrøm |
| Winners: | Lillestrøm (2nd title) |
| Second: | Brann |
| Prev Season: | 1977 |
| Next Season: | 1979 |
The 1978 Norwegian Football Cup was the 73rd edition of the Norwegian annual knockout football tournament. The Cup was won by Lillestrøm after beating Brann in the cup final with the score 2–1. This was Lillestrøm's second Norwegian Cup title.
|-|colspan="3" style="background-color:#97DEFF"|Replay|-|colspan="3" style="background-color:#97DEFF"|2nd replay|}
|-|colspan="3" style="background-color:#97DEFF"|Replay|}
|colspan="3" style="background-color:#97DEFF"|25 July 1978|-|colspan="3" style="background-color:#97DEFF"|26 July 1978|-|colspan="3" style="background-color:#97DEFF"|27 July 1978|-|colspan="3" style="background-color:#97DEFF"|29 July 1978|-|colspan="3" style="background-color:#97DEFF"|30 July 1978|-|colspan="3" style="background-color:#97DEFF"|2 August 1978|-|colspan="3" style="background-color:#97DEFF"|3 August 1978|-|colspan="3" style="background-color:#97DEFF"|Replay: 2 August 1978|}
|colspan="3" style="background-color:#97DEFF"|23 August 1978|-|colspan="3" style="background-color:#97DEFF"|24 August 1978|}
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Lillestrøm's winning squad: Arne Amundsen, Per Berg (Arne Dokken 45), Jan Birkelund, Tore Kordahl, Georg Hammer, Frank Grønlund, Gunnar Lønstad, ØivindTomteberget, Leif Hansen, Tom Lund, Vidar Hansen and Rolf Nordberg.
Brann's team: Jan Knudsen, Helge Karlsen, Bjørn Brandt, Terje Rolland, Tore Nordtvedt, Kjell Rune Pedersen (Ingvar Dalhaug 81), Atle Hellesø,Neil MacLeod, Ingvald Huseklepp, Steinar Aase and Bjørn Tronstad.