| | Event type
4 × 100 metres Freestyle Relay, Girls
| Date | 11 October 2018 — 19:14 | |
|---|---|---|
| Status | YOG | |
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires | |
| Participants | 24 from 6 countries | |
| Format | Final round only. | |
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | |||
|---|---|---|---|---|---|---|---|---|
| 1 | – | Russian Federation |  RUS | 3:45.26 | Gold | |||
| Yelizaveta Klevanovich | 55.92 | – (–) | ||||||
| Anastasiya Makarova | 56.84 | – (–) | ||||||
| Darya Vaskina | 57.19 | – (–) | ||||||
| Polina Yegorova | 55.31 | – (–) | ||||||
| 2 | – | Brazil |  BRA | 3:47.20 | Silver | |||
| Rafaela Raurich | 56.46 | – (–) | ||||||
| Ana Vieira | 56.48 | – (–) | ||||||
| Maria Pessanha | 56.76 | – (–) | ||||||
| Fernanda de Goeij | 57.50 | – (–) | ||||||
| 3 | – | Japan |  JPN | 3:49.27 | Bronze | |||
| Miku Kojima | 57.81 | – (–) | ||||||
| Mayuka Yamamoto | 55.67 | – (–) | ||||||
| Nagisa Ikemoto | 55.76 | – (–) | ||||||
| Shiori Asaba | 1:00.03 | – (–) | ||||||
| 4 | – | People's Republic of China |  CHN | 3:53.19 | ||||
| Yang Junxuan | 56.00 | – (–) | ||||||
| Peng Xuwei | 58.68 | – (–) | ||||||
| Zheng Muyan | 1:02.43 | – (–) | ||||||
| Lin Xintong | 56.08 | – (–) | ||||||
| 5 | – | United States |  USA | 3:53.32 | ||||
| Kate Douglass | 56.65 | – (–) | ||||||
| Rhyan White | 59.81 | – (–) | ||||||
| Maddie Donohoe | 58.60 | – (–) | ||||||
| Kaitlynn Sims | 58.26 | – (–) | ||||||
| 6 | – | South Africa |  RSA | 3:57.40 | ||||
| Duné Coetzee | 58.39 | – (–) | ||||||
| Christin Mundell | 58.84 | – (–) | ||||||
| Kate Beavon | 59.07 | – (–) | ||||||
| Mariella Venter | 1:01.10 | – (–) | ||||||
| – | Australia |  AUS | – |