The following is a list of alternates for the 2021 Massachusetts Junior 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 | Brendan Zinck | Youth on Course | Bear Hill GC | 7/1 |
| 2 | Troy Guiffre | Wellesley CC | Bayberry Hills – Links | 7/1 |
| 3 | Cian Goulet | Norton CC | Bear Hill GC | 7/1 |
| 4 | Michael Matheson | Walpole CC | Harmon GC | 7/1 |
| 5 | Nicholas Mercer | NEPGA | Bayberry Hills – Links | 7/1 |
| 6 | Riley Breen | Cold Spring CC | Agawam GC | 7/1 |
| 7 | Michael Leonetti | Blue Hill CC | Milton-Hoosic Club | 7/26 |
| 8 | Peter Torres | Segregansett CC | Westborough GC | 7/31 |
| 9 | William Pieczynski | Cohasse CC | Agawam GC | |
