| Event: | Girls' 78 kg |
| Games: | 2018 Summer Youth |
| Venue: | Parque Polideportivo Roca |
| Date: | October 9 |
| Competitors: | 13 |
| Nations: | 13 |
| Gold: | Raffaela Igl |
| Goldnoc: | GER |
| Silver: | Margarita Gritsenko |
| Silvernoc: | KAZ |
| Bronze: | Eduarda Rosa |
| Bronzenoc: | BRA |
| Bronze2: | Metka Lobnik |
| Bronzenoc2: | SLO |
| Prev: | 2014 |
| Next: | 2026 |
The Girls' 78 kg competition at the 2018 Summer Youth Olympics was held on 9 October, at the Asia Pavilion.
All times are in local time (UTC-3).
Legend