The 2012–13 Mestis season was the 13th season of the Mestis, the second level of ice hockey in Finland. Twelve teams participated in the league, and Jukurit won the championship.
| Rank | Team | GP | W | OTW | OTL | L | GF | GA | Pts |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Jukurit | 48 | 29 | 3 | 5 | 12 | 150 | 106 | 95 |
| 2 | TuTo Hockey | 48 | 24 | 6 | 4 | 13 | 161 | 128 | 89 |
| 3 | Sport | 48 | 23 | 5 | 2 | 18 | 147 | 127 | 81 |
| 4 | Hokki | 48 | 20 | 7 | 7 | 14 | 133 | 119 | 81 |
| 5 | KooKoo | 48 | 20 | 7 | 5 | 16 | 142 | 133 | 79 |
| 6 | Jokipojat | 48 | 20 | 4 | 6 | 18 | 155 | 144 | 74 |
| 7 | Peliitat | 48 | 19 | 3 | 4 | 22 | 154 | 159 | 67 |
| 8 | LeKi | 48 | 18 | 4 | 5 | 21 | 144 | 154 | 67 |
| 9 | 48 | 14 | 7 | 5 | 21 | 136 | 152 | 61 | |
| 10 | SaPKo | 48 | 15 | 5 | 6 | 22 | 132 | 153 | 61 |
| 11 | K-Vantaa | 48 | 13 | 6 | 8 | 21 | 123 | 144 | 59 |
| 12 | HCK | 48 | 11 | 6 | 5 | 26 | 110 | 168 | 50 |
| Rank | Team | GP | W | OTW | OTL | L | GF | GA | Diff | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | HCK | 6 | 5 | 1 | 0 | 0 | 23 | 10 | +13 | 17 | |
| 2. | RoKi | 6 | 3 | 1 | 0 | 2 | 15 | 11 | +4 | 11 | |
| 3. | KeuPa HT | 6 | 1 | 0 | 1 | 4 | 19 | 27 | -8 | 4 | |
| 4. | Pyry Nokia | 6 | 1 | 0 | 1 | 4 | 19 | 28 | -9 | 4 |