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| Sport | Basketball |
|---|---|
| Founded | May 24, 2021[1] |
| Founder | Kuan Kuang-Chung |
| First season | 2021–22 |
| COO | Hsieh Chih-Cheng |
| Commissioner | Chien Wei-Chuan |
| No. of teams | 5 |
| Country | Taiwan |
| Most recent champion(s) | Taiwan Beer Leopards (1st title) |
| Most titles | Kaohsiung Aquas New Taipei CTBC DEA Taiwan Beer Leopards (1 each) |
| TV partner(s) | VL Sports ELTA TV |
| Official website | t1league |
The T1 League (Chinese: T1聯盟) is a professional basketball league in Taiwan composed of 5 teams. It is the third Taiwanese professional basketball league after the now-defunct Chinese Basketball Alliance (CBA; 1994–1999) and P. League+ (PLG; founded in 2020).