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| Sport | Basketball |
|---|---|
| Founded | May 24, 2021[1] |
| Founder | Kuan Kuang-Chung |
| First season | 2021–22 |
| Ceased | July 9, 2024 |
| Country | Taiwan |
| Last champion(s) | Taiwan Beer Leopards (1st title) |
| Most titles | Kaohsiung Aquas New Taipei CTBC DEA Taiwan Beer Leopards (1 each) |
| Official website | t1league |
The T1 League (Chinese: T1聯盟) was a professional basketball league in Taiwan. It was the third Taiwanese professional basketball league after the now-defunct Chinese Basketball Alliance (CBA; 1994–1999) and P. League+ (PLG; founded in 2020).