The Norwegian men's football cup 2005 started on May 7. It was contested by 128 teams, going through 7 rounds before a winner could be declared. The final match was played on November 6.
The clubs from Tippeligaen all made it to round 3 (round of 32) without problems. Two surprises came in round 3, as F.C. Lyn Oslo and Tromsø I.L. lost to Hønefoss B.K. and Alta I.F. respectively. Alta's inclusion into round 4 (round of 16) marked the longest a club from Finnmark had ever come in the Norwegian men's football cup. Alta lost to Odd Grenland in round 4, while Hønefoss B.K. continued to surprise, eventually making it to round 6 (the semi finals) before being knocked out.