The following is a list of alternates for the 2021 Massachusetts Senior Amateur Championship.
To review Mass Golf’s alternate policy in full, please click here. Any questions about the alternate policy can be directed to Drew Rosen via email (drosen@massgolf.org) or phone (774-430-9096).
| Rank | Name | Affiliation | Qualifying Site | Date Added |
| 1 | Dave Turgeon | Norton CC | Olde Scotland Links | 9/15 |
| 2 | Dom Petruzzelli | Thomson CC | Belmont CC | 9/15 |
| 3 | Michael McCarthy | Framingham CC | Belmont CC | 9/26 |
| 4 | Dave Kilfoil | Pocasset GC | Wyckoff CC | 9/27 |
| 5 | Gary Galonek | Pleasant Valley CC | Blissful Meadows GC | 9/27 |
| 6 | Joe LeRoy | Indian Pond CC | Olde Scotland Links | 9/27 |
| 7 | Richard Monaghan | Cape Cod National GC | Blissful Meadows GC | 9/27 |
| 8 | Patrick Kline | Sandy Burr CC | Olde Scotland Links | 9/27 |
| 9 | Cy Kilgore | Tedesco CC | Olde Scotland Links | |
| 10 | Aram Hintlian | Brae Burn CC | Blissful Meadows GC | |
| 11 | Rick Fleischman | Hopkinton CC | Belmont CC | |
| 12 | Alex McCallum | Cyprian Keyes GC | Belmont CC | |
| 13 | Michael Murphy | Blackstone National GC | Blissful Meadows GC | |
| 14 | Matt Ortega | Stockbridge GC | Wyckoff CC | |
| 15 | Steven Auerbach | Blue Hill CC | Olde Scotland Links | |
| 16 | James Ferrera | Wollaston GC | Olde Scotland Links | |
| 17 | Paul Osypuk | Ledges GC | Wyckoff CC |
