| Event: | Girls' 78 kg |
| Games: | 2014 Summer Youth |
| Venue: | Longjiang Gymnasium |
| Date: | 19 August |
| Competitors: | 10 |
| Nations: | 10 |
| Gold: | Brigita Matić |
| Goldnoc: | CRO |
| Silver: | Aleksandra Samardžić |
| Silvernoc: | BIH |
| Bronze: | Elvismar Rodríguez |
| Bronzenoc: | VEN |
| Bronze2: | Sara Rodríguez |
| Bronzenoc2: | ESP |
| Prev: | 2010 |
| Next: | 2018 |
The Girls' 78 kg tournament in Judo at the 2014 Summer Youth Olympics was held on 19 August at the Longjiang Gymnasium.
This event was the heaviest of the girl's judo weight classes, limiting competitors to a maximum of 78 kilograms of body mass. The tournament bracket consisted of a single-elimination contest culminating in a gold medal match. There was also a repechage to determine the winners of the two bronze medals. Each judoka who had lost before the finals competed in the repechage with the two finalists getting bronze medals.