| 2017–18 Mestis | |
| League: | Mestis |
| Sport: | Ice hockey |
| Duration: | September 2017 – March 2018 |
| No Of Teams: | 12 |
| Season: | Regular season |
| Season Champs: | KeuPa HT |
| Season Champ Name: | Best record |
| Second Place: | SaPKo |
| Top Scorer: | Joona Jääskeläinen |
| Playoffs: | Playoffs |
| Finals Champ: | KeuPa HT |
| Finals Runner-Up: | TUTO Hockey |
| Seasonslist: | List of Mestis seasons |
| Seasonslistnames: | Mestis |
| Prevseason Link: | 2016–17 Mestis season |
| Prevseason Year: | 2016–17 |
| Nextseason Link: | 2018–19 Mestis season |
| Nextseason Year: | 2018–19 |
The 2017–18 Mestis season is the 18th season of Mestis, the second highest level of ice hockey in Finland after Liiga. Imatran Ketterä was promoted from Suomi-sarja at the end of last season, while JYP-Akatemia and Hokki faced bankruptcy and were relegated.
| Team | City | Home arena, capacity | Founded | Head coach | ||
|---|---|---|---|---|---|---|
| Espoo United | Espoo | Espoo Metro Areena, 6,982 | align=center | 2016 |  Niko Marttila | |
| Hermes | Kokkola | Kokkolan jäähalli, 4,200 | 1953 | 14.12.2017 Ari-Pekka Pajuluoma | ||
| IPK | Iisalmi | Kankaan jäähalli, 1,358 | align=center | 1966 | Janne Sinkkonen | |
| Jokipojat | Joensuu | Mehtimäki Ice Hall, 4,800 | align=center | 1953 | Jouni Varis | |
| Ketterä | Imatra | Imatra Spa Areena, 1,300 | align=center | 1957 | Maso Lehtonen | |
| KeuPa HT | Keuruu | Keuruun Jäähalli, 1,100 | align=center | 1995 | Mikko Heiskanen | |
| Kiekko-Vantaa | Vantaa | Trio Areena, 2,004 | align=center | 1994 | Pasi Arvonen | |
| LeKi | Lempäälä | Masku Areena, 900 | align=center | 1904 | Miikka Kuusela | |
| Peliitat | Heinola | Versowood Areena, 2,686 | align=center | 1984 | 1.3.2018 Jani Keinänen | |
| RoKi | Rovaniemi | Lappi Areena, 3,500 | align=center | 1979 | Petri Karjalainen | |
| SaPKo | Savonlinna | Talvisalo ice rink, 2,833 | align=center | 1929 | Pasi Räsänen | |
| TUTO Hockey | Turku | Marli Areena, 3,000 | align=center | 1929 | Miika Elomo |
Top eight advance to the Mestis playoffs while the bottom two face the top two teams from Suomi-sarja for a relegation playoff. Since the highest series of Finnish hockey is a closed series no team will be promoted to Liiga.
Rules for classification: 1) Points; 2) Goal difference; 3) Goals scored; 4) Head-to-head points; 5) Penalty minutes.[1]
Playoffs are being played in three stages. Each stage is a best-of-7 series. The teams are reseeded after the quarterfinals, so that the best team by regular season performance to make the semifinals faces the worst team in the semifinals.
KeuPa HT wins the series 4-2.
The bottom two teams will face the top two teams from Suomi-sarja for a best-of-7 series were the winners will get a place in Mestis for the next season.No team got relegated from or promoted to Mestis for the next season.