1966 Icelandic Cup
The 1966 Icelandic Cup was the seventh edition of the National Football Cup.
It took place between 16 July 1966 and 23 October 1966, with the final played at Melavöllur in Reykjavík. The cup was important, as winners qualified for the UEFA Cup Winners' Cup. Teams from the Úrvalsdeild karla did not enter until the quarter-finals. In prior rounds, teams from the 2. Deild, as well as reserve teams, played in one-legged matches. In case of a draw, the match was replayed.
KR Reykjavík won their 6th Cup in 7 seasons, beating the Icelandic champions, Valur Reykjavík, 1 - 0 in the final.
Second round
| Team 1 | Team 2 | Result |
| KR Reykjavík B | Víkingur Reykjavík | 1 - 0 |
| ÍB Isafjörður | þrottur Reykjavík B | 2 - 0 |
| FH Hafnarfjörður | Týr Vestmannaeyjar | 2 - 0 |
| Fram Reykjavík | Valur Reykjavík B | 4 - 2 |
Quarter finals
| Team 1 | Team 2 | Result |
| þrottur Reykjavík | ÍB Isafjörður | 4 - 2 |
| KR Reykjavík | IA Akranes | 10 - 0 |
| Valur Reykjavík | ÍBA Akureyri | 3 - 1 |
| Fram Reykjavík | ÍBK Keflavík | 0 - 1 |
Final
- KR Reykjavík won their sixth Icelandic Cup and qualified for the 1967–68 European Cup Winners' Cup.