| Event: | Girls' 800 metre freestyle |
| Competition: | 2018 Summer Youth Olympics |
| Year: | 2018 |
| Type: | Summer Youth Olympics |
| Venue: | Natatorium |
| Dates: | 9 October |
| Competitors: | 21 |
| Nations: | 19 |
| Win Value: | 8:27.60 |
| Gold: | Ajna Késely |
| Goldnoc: | HUN |
| Silver: | Delfina Pignatiello |
| Silvernoc: | ARG |
| Bronze: | Marlene Kahler |
| Bronzenoc: | AUT |
| Prev: | 2014 |
| Next: | 2026 |
The girls' 800 metre freestyle event at the 2018 Summer Youth Olympics took place on 9 October at the Natatorium in Buenos Aires, Argentina.[1]
The heats were started at 10:00 and 18:00.[2]
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 3 | 5 | 8:27.60 | |||||
| 3 | 4 | 8:32.42 | |||||
| 3 | 2 | 8:36.57 | |||||
| 3 | 8 | 8:43.71 | |||||
| 3 | 3 | 8:43.73 | |||||
| 2 | 3 | 8:44.69 | |||||
| 3 | 1 | 8:46.40 | |||||
| 2 | 6 | 8:48.88 | |||||
| 3 | 6 | 8:48.96 | |||||
| 10 | 3 | 7 | 8:49.85 | ||||
| 11 | 2 | 5 | 8:52.29 | ||||
| 12 | 2 | 1 | 8:54.64 | ||||
| 13 | 2 | 2 | 8:54.89 | ||||
| 14 | 1 | 4 | 8:56.14 | ||||
| 15 | 1 | 5 | 8:57.00 | ||||
| 16 | 2 | 4 | 8:59.60 | ||||
| 17 | 2 | 7 | 9:02.08 | ||||
| 18 | 2 | 8 | 9:05.25 | ||||
| 19 | 1 | 3 | 9:16.73 | ||||
| 20 | 1 | 6 | 9:18.92 | ||||
| 21 | 1 | 2 | 9:28.18 |