The 1977 Norwegian Football Cup was won by Lillestrøm after beating Bodø/Glimt 1–0 in the final on 23 October 1977. This was the first time Lillestrøm won the Norwegian Cup.
While Third Division side Sogndal was the biggest surprise in the previous season by reaching the final, this year's surprise was Raufoss who reached the semifinal for the first time. Raufoss had eliminated the First Division sides Vålerengen, Brann and Moss, but were eliminated by Lillestrøm in the semifinal. Steinkjer, which were playing in the Second Division eliminated Rosenborg and HamKam, but lost 3–0 against Bodø/Glimt in the semifinal. This was the second consecutive year that Steinkjer reached the semifinal.
In the final, Lillestrøm won 1–0 against Bodø/Glimt, with their biggest star, Tom Lund scoring the only goal. This was Lillestrøm's fourth final, and the first time they won the Norwegian Cup.