2017–18 TFF First League
The 2017–18 TFF First League is the 17th season since the league was established in 2001 and 55th season of the second-level football league of Turkey since its establishment in 1963–64.
Teams
- Rizespor, Gaziantepspor and Adanaspor relegated from 2016–17 Süper Lig.
- Sivasspor, Yeni Malatyaspor and Göztepe promoted to 2017–18 Süper Lig.
- İstanbulspor, Erzurum BB and Ankaragücü promoted from 2016–17 TFF Second League.
- Şanlıurfaspor, Bandırmaspor and Mersin İdmanyurdu relegated to 2017–18 TFF Second League.
Stadia and locations
| Team | Home city | Stadium | Capacity |
| Adana Demirspor | Adana | Adana 5 Ocak Stadium | 14,805 |
| Adanaspor | Adana | Adana 5 Ocak Stadium | 14,805 |
| Altınordu | İzmir | İzmir Atatürk Stadium | 51,295 |
| Ankaragücü | Ankara | Ankara 19 Mayıs Stadium | 19,219 |
| Balıkesirspor | Balıkesir | Balıkesir Atatürk Stadium | 15,800 |
| Boluspor | Bolu | Bolu Atatürk Stadium | 8,881 |
| Denizlispor | Denizli | Denizli Atatürk Stadium | 15,420 |
| Elazığspor | Elazığ | Elazığ Atatürk Stadium | 13,923 |
| Erzurum BB | Erzurum | Kazım Karabekir Stadium | 23,700 |
| Eskişehirspor | Eskişehir | Eskişehir Atatürk Stadium | 13,520 |
| Gaziantepspor | Gaziantep | New Gaziantep Stadium | 35,558 |
| Gazişehir Gaziantep | Gaziantep | New Gaziantep Stadium | 35,558 |
| Giresunspor | Giresun | Giresun Atatürk Stadium | 12,191 |
| İstanbulspor | Istanbul | Bahçelievler Stadium | 4,100 |
| Manisaspor | Manisa | Manisa 19 Mayıs Stadium | 18,881 |
| Rizespor | Rize | Yeni Rize Şehir Stadı | 15,558 |
| Samsunspor | Samsun | Samsun 19 Mayıs Stadium | 16,480 |
| Ümraniyespor | Istanbul | Ümraniye Town Stadium | 15,000 |