| Competition: | Ykkönen |
| Season: | 2017 |
| Winners: | TPS |
| Promoted: | TPS FC Honka |
| Relegated: | GrIFK Gnistan |
| Promotion To: | 2018 Veikkausliiga |
| League Topscorer: | Felix De Bona Kalle Multanen (14 goals each) |
| Matches: | 135 |
| Total Goals: | 388 |
| Biggest Home Win: | TPS 6–0 EIF (14 June) |
| Biggest Away Win: | FC Haka 0–4 FC Honka (29 April) FC Haka 1–5 AC Oulu (1 July) AC Oulu 0–4 FF Jaro (5 August) |
| Highest Scoring: | FF Jaro 5–2 GrIFK (3 September) |
| Prevseason: | 2016 |
| Nextseason: | 2018 |
The 2017 Ykkönen was the 46th season of Ykkönen, the second highest football league in Finland. The season started on 29 April 2017 and ended on 21 October 2017.[1] The winning team qualified directly for promotion to the 2018 Veikkausliiga, while the second had to play a play-off against the eleventh-placed team from Veikkausliiga to decide who would play in that division. The bottom two teams were relegated to Kakkonen.
A total of ten teams contested in the league,[2] including seven sides from the 2016 season, and FC Honka and Gnistan who were promoted from Kakkonen after winning the promotion play-offs.
PK-35 Vantaa, who were relegated from Veikkausliiga, declared bankruptcy and withdrew their spot from the league.[3] OPS took their spot in the league.[4]
KTP and FC Jazz were relegated from 2016 Ykkönen.
JJK, the champion of 2016 Ykkönen, was promoted to the 2017 Veikkausliiga.
| Club | Location | Stadium | Capacity | Manager | |
|---|---|---|---|---|---|
| AC Oulu | Oulu | Raatin Stadion | 6,996 |  | |
| EIF | Raseborg | Ekenäs Centrumplan | 2,500 | | |
| FC Haka | Valkeakoski | Tehtaan kenttä | 3,516 | | |
| FC Honka | Espoo | Tapiolan Urheilupuisto | 6,000 | | |
| FF Jaro | Jakobstad | Jakobstads Centralplan | 5,000 | | |
| Gnistan | Helsinki | Mustapekka Areena | 1,100 |  | |
| GrIFK | Kauniainen | Kauniaisten Keskuskenttä | 700 | | |
| KPV | Kokkola | Kokkolan Keskuskenttä | 2,000 | | |
| OPS | Oulu | Raatin Stadion | 6,996 | | |
| TPS | Turku | Veritas Stadion[5] | 10,000 | |
| Team | Outgoing manager | Manner of departure | Date of vacancy | Incoming manager | Date of appointment | Table |
|---|---|---|---|---|---|---|
| FC Haka | Kari Martonen | End of contract | n/a | Keith Armstrong | 22 November 2016[6] | Pre-season |
| GrIFK | Rami Luomanpää | End of contract | n/a | Ari Asukka | 24 November 2016[7] | Pre-season |
| FC Honka | Juho Rantala | Signed by HJK | 1 December 2016[8] | Vesa Vasara | 5 December 2016[9] | Pre-season |
| EIF | Ilkka Marttila | End of contract | n/a | Jens Mattfolk | 5 December 2016[10] | Pre-season |
| FF Jaro | Kristian Heames | Sacked | 10 July 2017[11] | Calle Löf | 10 July 2017 | 7th |
| Gnistan | Tommi Lingman | Mutual termination | 17 July 2017[12] | Roberto Nuccio | 20 July 2017[13] | 10th |