| Event: | Mixed doubles |
| Games: | 2018 Summer Youth |
| Venue: | Buenos Aires Lawn Tennis Club |
| Date: | 9–14 October |
| Competitors: | 64 |
| Nations: | 40 |
| Longnames: | yes |
| Gold: | Yuki Naito Naoki Tajima |
| Goldnoc: | JPN |
| Silver: | Camila Osorio Nicolás Mejía |
| Silvernoc: | COL |
| Bronze: | Clara Burel Hugo Gaston |
| Bronzenoc: | FRA |
| Prev: | 2014 |
| Next: | 2026 |
| Quadrennial: | yes |
| Multi: | yes |
| Type: | juniors mixed |
These are the results for the mixed doubles event at the 2018 Summer Youth Olympics.
See main article: Tennis at the 2018 Summer Youth Olympics.