| Turkish Basketball Second League (TB2L) | |
| Formerly: | Turkish Basketball Third League (TB3L) |
| Sport: | Basketball |
| Confed: | Turkish Basketball Federation |
| Founded: | 2011 |
| Teams: | 20 |
| Country: | Turkey |
| Champion: | TED Ankara Kolejliler (1st title) |
| Levels: | 3 |
| Pyramid: | Turkish basketball league system |
| Promotion: | TBL |
| Relegation: | EBBL |
| Website: | Link |
The Turkish Basketball Second League, also called TB2L, is the third-tier level league of professional club basketball in Turkey. The league was previously called the Turkish Basketball Third League (TB3L).
There are a total of 15 teams participating in the league for the TB2L 2019–20 season. Each team plays each other in their group twice during the regular season. The top 8 teams from each group qualify to an elimination round (best of 3 games). Winners in elimination games qualify to the Quarterfinals (best of 3 games). Winners in the quarterfinals qualify to a final group (round robin). The top two teams in the final group are promoted to the second-tier level Turkish Basketball First League (TBL) for the next season.
| Season | Champions | Runners-up | |
|---|---|---|---|
| 2012–13 | Trabzonspor | Uşak Univ. | |
| 2013–14 | Darüşşafaka Doğuş | İstanbul Büyükşehir Belediyespor | |
| Yeşilgiresun Belediye | Tüyap Büyükçekmece | ||
| 2015–16 | Tofaş | Best Balıkesir | |
| 2016–17 | Sakarya BB | Eskişehir | |
| 2017–18 | Final Spor | Manisa Büyükşehir Belediye | |
| 2018–19 | Merkezefendi Belediyesi Denizli Basket | Bornova Belediyespor | |
| 2020–21 | TED Ankara Kolejliler | Mersin BBGSK |
| Team[1] | City | |
|---|---|---|
| Afyon Belediye S.K. | Afyonkarahisar | |
| Büyük Anadolu | Ankara | |
| Çağdaş Bodrum | Muğla | |
| Diyarbakır Basketbol Ateşi | Diyarbakır | |
| Gaziantep Gençlik Gelişim Basketbol | Gaziantep | |
| Gençlik Spor Vakfı | Ankara | |
| İlkler Şehri Uşak Basketbol | Uşak | |
| İstanbul Büyükşehir Belediyesi | Istanbul | |
| İstanbul Efendileri Basketbol | Istanbul | |
| Kadıköy Basketbol | Istanbul | |
| Karşıyaka Belediyesi | İzmir | |
| Lima | Istanbul | |
| NEF Vakfı | Istanbul | |
| Özel Gelişim Koleji | İzmir | |
| Samsun Basketbol Akademi | Samsun | |
| Sertaş | Adana | |
| Teşvikiye | Istanbul | |
| Üsküdar Belediyesi | Istanbul | |
| Vefa | Istanbul | |
| Yeni Sincan | Ankara |