| Nextseason: | 2019–20 |
| Basketbol Süper Ligi | |
| Season: | 2018–19 |
| Champions: | Anadolu Efes (14th title) |
| Semifinalists: | Galatasaray Doğa Sigorta Tofaş |
| Relegated: | Adatıp Sakarya BB |
| Teams: | 15 |
| Mvp: | Assem Marei |
| Mvp N: | EGY |
| Finals Mvp Link: | Basketbol Süper Ligi Finals MVP |
| Finals Mvp N: | USA |
| Pir: | 22.7 |
| Pir N: | EGY |
| Ppg: | 21.7 |
| Ppg N: | USA |
| Rpg: | 11.8 |
| Rpg N: | USA |
| Apg: | 6.7 |
| Apg N: | SRB |
The 2018–19 Basketbol Süper Ligi was the 53rd season of the Basketbol Süper Ligi, the top-tier level professional club basketball league in Turkey. The season started on 6 October 2018 and ended 21 June 2019.
Anadolu Efes captured its fourteenth title and its first championship in 10 years, after it defeated Fenerbahçe in seven in the finals.
Yeşilgiresun Belediye and Uşak Sportif were relegated after finishing in the last two places during the previous season. Türk Telekom promoted as the champions of the Turkish Basketball First League (TBL).[1] Afyon Belediye promoted as the winners of the play-offs.[2]
On 12 July 2018, Eskişehir Basket announced its withdrawal from the BSL.[3] On 13 July 2018, it was announced that Bahçeşehir Koleji received the vacant BSL spot.[4]
On 2 October 2018, Trabzonspor announced its withdrawal from the BSL.[5]
| Team | Head Coach | Captain | Kit manufacturer | Main shirt sponsor | |
|---|---|---|---|---|---|
| Afyon Belediye |  Can Sevim | Altan Erol | Dafron | Afjet | |
| Anadolu Efes | Ergin Ataman | Doğuş Balbay | S by Sportive | Efes | |
| Bahçeşehir Koleji | Stefanos Dedas | Yiğitcan Turna | Playoff | Bahçeşehir College | |
| Banvit | Hakan Demir | Tolga Geçim & Rıdvan Öncel | Dafron | Banvit | |
| Beşiktaş Sompo Japan |  Duško Ivanović | Muratcan Güler | Adidas | Sompo Japan Sigorta | |
| Selçuk Ernak | Oğuz Savaş | Under Armour | Garanti Bank | ||
| Arel Üniversitesi Büyükçekmece | Serhat Şehit |  Kenny Hayes | Dafron | Istanbul Arel University | |
| Fenerbahçe Beko |  Željko Obradović | Melih Mahmutoğlu | Nike | Beko | |
| Ertuğrul Erdoğan | Göksenin Köksal | Givova | N/A | ||
 Nenad Marković | Can Uğur Öğüt | Dafron | N/A | ||
| Hakan Yavuz | Mehmet Yağmur | Adidas | Intercity | ||
| Pınar Karşıyaka | Dirk Bauermann | Erdi Gülaslan | S by Sportive | Pınar | |
| Adatıp Sakarya BB | Ozan Bulkaz | - | Tryon | Adatıp Hastanesi | |
| Orhun Ene |  Sammy Mejía | Dafron | Fiat | ||
| Türk Telekom | Burak Gören | Kaya Peker | Fertino | Türk Telekom |
See main article: 2019 BSL Playoffs.
| Category[6] | Player | Club | Average |
|---|---|---|---|
| Efficiency | 22.7 | ||
| Points | 21.7 | ||
| Rebounds | 11.8 | ||
| Assists | 6.7 | ||
| Blocks | 1.3 | ||
| Steal | 1.7 | ||
| Team | Competition | Progress |
|---|---|---|
| EuroLeague | Runners-up | |
| Final-Four | ||
| Regular season | ||
| EuroCup | Regular season | |
| Regular season | ||
| Regular season | ||
| Champions League | Round of 16 | |
| Round of 16 | ||
| Third qualifying round | ||
| FIBA Europe Cup | Regular season | |
| Quarter-finals | ||
| Regular season | ||