2017–18 TFF 1. Lig
The 2017–18 TFF 1. Lig 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.