2021 French Open – Boys' singles
| Boys' singles | |
|---|---|
| 2021 French Open | |
| Champion | Luca Van Assche |
| Runner-up | Arthur Fils |
| Score | 6–4, 6–2 |
Luca Van Assche won the title, defeating Arthur Fils in an all-French final, 6–4, 6–2. This was the first Grand Slam junior tournament with all-French semifinalists.
Dominic Stricker was the defending champion, but was no longer eligible to participate in junior events.