The 1979–80 Nationalliga A season was the 42nd season of the Nationalliga A, the top level of ice hockey in Switzerland. Eight teams participated in the league, and EHC Arosa won the championship.
| Pl. | Team | GP | W | T | L | GF–GA | Pts | |
|---|---|---|---|---|---|---|---|---|
| 1. | EHC Arosa | 28 | 17 | 1 | 10 | 129:99 | 35 | |
| 2. | SC Bern | 28 | 15 | 4 | 9 | 136:118 | 34 | |
| 3. | HC Davos | 28 | 16 | 2 | 10 | 126:113 | 34 | |
| 4. | EHC Biel | 28 | 16 | 1 | 11 | 116:83 | 33 | |
| 5. | SC Langnau | 28 | 13 | 4 | 11 | 123:108 | 30 | |
| 6. | EHC Kloten | 28 | 11 | 4 | 13 | 111:105 | 26 | |
| 7. | Lausanne HC | 28 | 8 | 4 | 16 | 105:150 | 20 | |
| 8. | HC La Chaux-de-Fonds | 28 | 5 | 2 | 21 | 93:163 | 12 |