The 1966 Finnish Cup was won by Reipas Lahti, who defeated Tappara in the final to claim the title.
1/16 finals[]
- Tarmo Pitajänmäki - Karhu-Kissat Helsinki 4-7
- TP-47 Tornio - RPS Rovaniemi 5-11
- Vesa Raahe - Kärpät Oulu 7-3
- LaVi Lapua - MäntU Mänttä 1-6
- PiPS Pieksämäki - MP Mikkeli 4-7
- KalPa Kuopio - JoKP Joensuu 2-4
- RPL Riihimäki - Tarmo Hämeenlinna 3-5
- Akilles Porvoo - Reipas Lahti 3-5
- Ilves Jämsänkoski - Tappara Tampere 2-14
- JyP Jyväskylä - Ilves Tampere 4-9
- HP-47 Heinola - HPK Hämeenlinna 6-1
- NoU Nokia - Koo-Vee Tampere 0-3
- ÅIFK Turku - RU-38 Pori 2-4
- KooKoo Kouvola - Upon Pallo Lahti 6-8
- Säppi Rauma - Karhut Pori 6-5
- KTP Kotka - SaiPa Lappeenranta 2-7
1/8 finals[]
- RPS Rovaniemi - Vesa Raahe 4-2
- MäntU Mänttä - Koo-Vee Tampere 3-9
- HP-47 Heinola - Tarmo Hämeenlinna 0-2
- JoKP Joensuu - MP Mikkeli (1-0 Forfeit win for Joensuu)
- Karhu-Kissat Helsinki - Reipas Lahti 3-5
- Säppi Rauma - RU-38 Pori 8-7
- Tappara Tampere - Ilves Tampere 7-4
- Upon Pallo Lahti - SaiPa Lappeenranta 6-5
Quarterfinals[]
- RPS Rovaniemi - Tarmo Hämeenlinna (1-0 Forfeit win for Rovaniemi)
- Säppi Rauma - Tappara Tampere 1-6
- Koo-Vee Tampere - JoKP Joensuu 7-1
- Reipas Lahti - Upon Pallo Lahti (1-0 Forfeit win for Reipas)
Semifinals[]
- Tappara Tampere - RPS Rovaniemi (1-0 Forfeit win for Tappara)
- Koo-Vee Tampere - Reipas Lahti 1-4
Final[]
- Reipas Lahti - Tappara Tampere 8-6 (2OT)