2020–21 TFF 1. Lig
The 2020–21 TFF 1. Lig was the 20th season since the league was established in 2001 and 58th season of the second-level football league of Turkey since its establishment in 1963–64. There was no relegation to or from the TFF First League the prior year due to the coronavirus pandemic.
Teams
- Hatayspor, BB Erzurumspor and Fatih Karagümrük promoted to 2020–21 Süper Lig.
- Bandırmaspor, Samsunspor and Tuzlaspor promoted from TFF 2. Lig.
- The bottom three teams will be relegated to the TFF 2. Lig.
Stadiums and locations
| Team | Home city | Stadium | Capacity |
| Adana Demirspor | Adana | Adana 5 Ocak Stadium | 14,805 |
| Adanaspor | Adana | Adana 5 Ocak Stadium | 14,805 |
| Akhisarspor | Manisa | Spor Toto Akhisar Stadium | 12,139 |
| Altay | İzmir | İzmir Atatürk Stadium | 51,295 |
| Altınordu | İzmir | Doğanlar Stadium | 12,500 |
| Ankara Keçiörengücü | Ankara | Ankara Aktepe Stadium | 4,883 |
| Ankaraspor | Ankara | Osmanlı Stadium | 20,000 |
| Balıkesirspor | Balıkesir | Balıkesir Atatürk Stadium | 15,800 |
| Bandırmaspor | Balıkesir | 17 Eylül Stadium | 12,725 |
| Boluspor | Bolu | Bolu Atatürk Stadium | 8,456 |
| Bursaspor | Bursa | Bursa Büyükşehir Belediye Stadium | 43,361 |
| Eskişehirspor | Eskişehir | Eskişehir Stadium | 34,930 |
| Giresunspor | Giresun | Giresun Atatürk Stadium | 12,191 |
| İstanbulspor | Istanbul | Necmi Kadıoğlu Stadium | 4,491 |
| Menemenspor | İzmir | Menemen İlçe Stadium | 2,500 |
| Samsunspor | Samsun | Samsun Stadium | 33,919 |
| Tuzlaspor | Istanbul | Tuzla Belediye Stadium | 2,000 |
| Ümraniyespor | Istanbul | Ümraniye Belediyesi Şehir Stadium | 1,601 |
League table
Positions by round
The table lists the positions of teams after each week of matches. In order to preserve chronological evolvements, any postponed matches are not included to the round at which they were originally scheduled, but added to the full round they were played immediately afterwards.Promotion playoffs
Top goalscorers
| Rank | Player | Team | Goals |
| 1 |  |