Standings for the 2021 Class A boys basketball season are below.
(Last updated Feb. 20, 2021)
Southeast A
| Conf. | Overall | |
| Laurel | 5-0 | 10-3 |
| Billings Central | 3-2 | 10-3 |
| Hardin | 2-2 | 4-5 |
| Livingston | 0-6 | 1-12 |
Northeast A
| Conf. | Overall | |
| Havre | 7-1 | 9-4 |
| Glendive | 5-3 | 10-5 |
| Lewistown | 5-3 | 9-5 |
| Miles City | 3-5 | 5-8 |
| Sidney | 0-8 | 2-13 |
Southwest A
| Conf. | Overall | |
| Dillon | 10-0 | 14-0 |
| Frenchtown | 6-4 | 11-5 |
| Butte Central | 5-5 | 9-6 |
| Corvallis | 5-5 | 6-9 |
| Hamilton | 4-6 | 7-8 |
| Stevensville | 0-10 | 0-14 |
Northwest A
| Conf. | Overall | |
| Polson | 10-0 | 14-1 |
| Ronan | 5-5 | 10-6 |
| Libby | 5-5 | 8-6 |
| Whitefish | 4-6 | 7-8 |
| Columbia Falls | 4-6 | 6-9 |
| Browning | 2-8 | 4-9 |
