| Type: | grandslamwc |
| Champ: |  João Fonseca |
| Runner: |  Learner Tien |
| Score: | 4–6, 6–4, 6–3 |
See main article: 2023 US Open (tennis).
João Fonseca won the boys' singles title at the 2023 US Open, defeating Learner Tien in the final, 4–6, 6–4, 6–3.[1]
Martín Landaluce was the reigning champion,[2] but chose not to participate.
Markus Mölder