| 2020 Section XI Overall Championship Bracket | ||||||
| Wednesday | Saturday | Friday | Thursday | |||
| February 19, 2020 | February 22, 2020 | February 28, 2020 | March 5, 2020 | |||
| Southold (13-8) | Amityville (21-2) | |||||
| C Champion | A Champion | |||||
| 51-30 | Southold (14-8) | 78-75 | Amityville (22-2) | |||
| @ Centereach HS | C/D Champion | @ Farmingdale State | A/B/C/D Champion | |||
| Smithtown Christian (9-10) | 55-107 | Center Moriches (21-1) | 80-72 | Amityville (23-2) | ||
| D Champion | @ Walt Whitman HS | B/C/D Champion | @ Ward Melville HS | Section XI Champion | ||
| Center Moriches (20-1) | Brentwood (23-1) | |||||
| B Champion | AA Champion | |||||