Türkiye Basketbol Ligi

The Turkish Basketball First League (Türkiye Basketbol Ligi; TBL), is the second-tier level league of professional club basketball in Turkey. The league was previously known as Turkish Basketball Second League (TB2L).

Format and promotion and relegation
There are a total of 18 teams participating in the league for the 2023-24 TBL season. Each team plays each other in their group twice during the regular season. Team finishes at first place promotes to the top-tier level Turkish Basketball Super League (BSL) for the next season, teams ranked 2nd place to 9th place, compete in playoff format and winner of the playoff also promotes. The last two teams are relegated to the third-tier level Turkish Basketball Second League.

League champions and promoted teams

 * 1970: Ankaragücü
 * 1971: Şekerspor
 * 1972: Kadıköyspor
 * 1973: Adana Demirspor, Samsunspor
 * 1974: Eczacıbaşı, Karşıyaka
 * 1975: ODTÜ, Adana Demirspor
 * 1976: Yenişehir, Tofaş
 * 1977: Muhafızgücü, Ziraat Fakültesi
 * 1978: Taçspor, Efes Pilsen
 * 1979: İTÜ, TED Ankara Kolejliler
 * 1980: Muhafızgücü, Güney Sanayi, ODTÜ, Mülkiye
 * 1981: Çukurova Sanayi, Antbirlik
 * 1982: TED Ankara Kolejliler, Oyak Renault
 * 1983: Ankara DSİ (withdrew)
 * 1984: Anadolu Hisarı İdman Yurdu, Hilalspor, TED Ankara Kolejliler
 * 1985: Yenişehir Hortaş, Tarsus İdman Yurdu (withdrew)
 * 1986: Oyak Renault (withdrew), Beslen Makarna, Nasaş, Şekerspor
 * 1987: Paşabahçe, Hilalspor
 * 1988: Tekirdağ Büyük Salat, Beykoz
 * 1989: Beşiktaş -, Nasaş
 * 1990: Tofaş, TED Ankara Kolejliler
 * 1991: Eczacıbaşı, PTT
 * 1992: Kayseri Meysu, Konyaspor, Oyak Renault, Yıldırımspor, Darüşşafaka, Ortaköy
 * 1993: Bakırköyspor, Antalyaspor, Çimtur (merger with Antalyaspor)
 * 1994: Taçspor, Antbirlik, Vestel (withdrew), Kayseri Meysu
 * 1995: Tuborg, Netaş
 * 1996: TED Ankara Kolejliler, İTÜ
 * 1997: Muratpaşa, Oyak Renault
 * 1998: Kuşadası, TED Ankara Kolejliler
 * 1999: İTÜ, Emlakbank (withdrew)
 * 2000: Altay, Antbirlik, Karagücü (withdrew), Büyük Kolej