| 2009–10 National League B | |
| League: | National League B |
| Sport: | Ice hockey |
| No Of Games: | 45 |
| No Of Teams: | 10 |
| Season: | Regular season |
| Season Champs: | EHC Visp |
| Second Place: | EHC Olten |
| Top Scorer: | Dominic Forget[1] |
| Playoffs: | Playoffs |
| Finals Champ: | Lausanne HC |
| Finals Runner-Up: | EHC Visp |
| Prevseason Link: | 2008–09 National League B season |
| Prevseason Year: | 2008–09 |
| Nextseason Link: | 2010–11 National League B season |
| Nextseason Year: | 2010–11 |
The 2009–10 National League B season was the 63rd season played in the National League B, Switzerland's second-tier professional ice hockey league. The season started with 11 teams, but the Young-Sprinters had to withdraw after 15 games due to financial difficulties.[2] In Round 38, Dominic Forget made a historic moment when he scored five seconds after the game started, a new league record.[3] EHC Visp won the regular season championship with a one-point edge over second-place EHC Olten. The winner of the playoffs was Lausanne HC, the third-ranked team of the regular season.
| Team | GP | W | L | OTW | OTL | GF | GA | Pts | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 1. | EHC Visp | 45 | 27 | 10 | 6 | 2 | 224 | 140 | 95 | |
| 2. | EHC Olten | 45 | 30 | 12 | 1 | 2 | 187 | 129 | 94 | |
| 3. | Lausanne HC | 45 | 28 | 12 | 2 | 3 | 166 | 121 | 91 | |
| 4. | HC Sierre-Anniviers | 45 | 21 | 12 | 5 | 7 | 161 | 132 | 80 | |
| 5. | HC Ajoie | 45 | 21 | 17 | 5 | 2 | 157 | 149 | 75 | |
| 6. | HC La Chaux-de-Fonds | 45 | 20 | 19 | 2 | 4 | 177 | 166 | 68 | |
| 7. | SC Langenthal | 45 | 16 | 26 | 3 | 0 | 124 | 156 | 54 | |
| 8. | EHC Basel Sharks | 45 | 12 | 28 | 1 | 4 | 111 | 180 | 42 | |
| 9. | HC Thurgau | 45 | 12 | 28 | 1 | 4 | 131 | 189 | 42 | |
| 10. | GC Küsnacht Lions | 45 | 10 | 33 | 2 | 0 | 123 | 199 | 34 | |
| 10. | Young Sprinters HC | - | - | - | - | - | - | - | - |
Since 2007, the four top-ranked clubs have been allowed to choose an opponent from places 5-8 in the table for the quarter-finals. The play-offs were played in a best-of-seven format.