| Event: | Boys' singles |
| Games: | 2018 Summer Youth |
| Venue: | Buenos Aires Lawn Tennis Club |
| Date: | 7–13 October |
| Competitors: | 32 |
| Nations: | 25 |
| Gold: | Hugo Gaston |
| Goldnoc: | FRA |
| Silver: | Facundo Díaz Acosta |
| Silvernoc: | ARG |
| Bronze: | Gilbert Soares Klier Júnior |
| Bronzenoc: | BRA |
| Prev: | 2014 |
| Next: | 2026 |
| Quadrennial: | yes |
| Multi: | yes |
| Type: | juniors mixed |
These are the results for the boys' singles event at the 2018 Summer Youth Olympics.
See main article: Tennis at the 2018 Summer Youth Olympics.