The 1972–73 Nationalliga A season was the 35th season of the Nationalliga A, the top level of ice hockey in Switzerland. Eight teams participated in the league, and HC La Chaux-de-Fonds won the championship.
Standings
| Pl. | Team | GP | W | T | L | GF–GA | Pts |
|---|---|---|---|---|---|---|---|
| 1. | HC La Chaux-de-Fonds | 28 | 19 | 2 | 7 | 153:85 | 40 |
| 2. | HC Sierre | 28 | 16 | 3 | 9 | 127:113 | 35 |
| 3. | EHC Kloten | 28 | 13 | 1 | 14 | 94:108 | 27 |
| 4. | HC Servette Genève | 28 | 10 | 6 | 12 | 115:108 | 26 |
| 5. | SC Langnau | 28 | 11 | 4 | 13 | 114:132 | 26 |
| 6. | HC Ambrì-Piotta | 28 | 10 | 5 | 13 | 111:116 | 25 |
| 7. | EHC Visp | 28 | 10 | 4 | 14 | 92:105 | 24 |
| 8. | HC Lugano | 28 | 9 | 3 | 16 | 90:129 | 21 |