# Swimming at the 2017 World Aquatics Championships – Women's 4 × 100 metre freestyle relay

The Women's 4 × 100 metre freestyle relay competition at the 2017 World Championships will be held on 23 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Australia | 3:30.65 | Rio de Janeiro, Brazil | 6 August 2016 |
| Competition record | Australia | 3:31.48 | Kazan, Russia | 2 August 2015 |

## Results
### Heats

The heats were held at 11:39.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 1 | 4 | United States | Lia Neal (53.94) Kelsi Worrell (53.27) Olivia Smoliga (53.67) Mallory Comerford (52.47) | 3:33.35 | Q |
| 2 | 1 | 5 | Netherlands | Maud van der Meer (54.72) Femke Heemskerk (52.72) Kim Busch (54.79) Ranomi Kromowidjojo (52.03) | 3:34.26 | Q |
| 3 | 2 | 4 | Australia | Emily Seebohm (54.32) Madison Wilson (53.94) Brittany Elmslie (53.61) Shayna Jack (53.31) | 3:35.18 | Q |
| 4 | 1 | 1 | Sweden | Michelle Coleman (53.21) Sarah Sjöström (52.19) Nathalie Lindborg (55.90) Louise Hansson (54.20) | 3:35.50 | Q |
| 5 | 2 | 5 | Canada | Sandrine Mainville (53.87) Michelle Toro (54.50) Rebecca Smith (53.93) Kayla Sanchez (53.54) | 3:35.84 | Q |
| 6 | 2 | 6 | China | Zhu Menghui (54.06) Ai Yanhan (54.71) Wu Yue (54.46) Zhang Yufei (53.79) | 3:37.02 | Q |
| 7 | 1 | 3 | Japan | Rikako Ikee (54.09) Tomomi Aoki (54.34) Yui Yamane (54.59) Chihiro Igarashi (54.44) | 3:37.46 | Q |
| 8 | 1 | 6 | Denmark | Signe Bro (54.85) Sarah Bro (55.60) Emilie Beckmann (55.55) Pernille Blume (52.29) | 3:38.29 | Q |
| 9 | 2 | 2 | Hungary | Flóra Molnár (54.93) Fanni Gyurinovics (55.16) Evelyn Verrasztó (54.73) Zsuzsanna Jakabos (54.08) | 3:38.90 | |
| 10 | 2 | 3 | Italy | Silvia Di Pietro (54.80) Erika Ferraioli (54.91) Giorgia Biondani (55.47) Federica Pellegrini (53.90) | 3:39.08 | |
| 11 | 2 | 1 | Israel | Andrea Murez (54.79) Zohar Shikler (56.75) Keren Siebner (56.03) Amit Ivry (56.78) | 3:44.35 | |
| 12 | 1 | 2 | Hong Kong | Siobhán Haughey (53.99 NR) Claudia Lau (56.26) Ho Nam Wai (57.48) Sze Hang Yu (56.66) | 3:44.39 | |
| 13 | 2 | 7 | South Africa | Erin Gallagher (55.94) Kate Beavon (59.98) Samantha Randle (1:00.68) Kaylene Corbett (1:01.23) | 3:57.83 | |
| | 1 | 7 | Slovakia | DNS | DNS | DNS |

### Final

The final was held at 19:03.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Mallory Comerford (52.59 AM) Kelsi Worrell (53.16) Katie Ledecky (53.83) Simone Manuel (52.14) | 3:31.72 | AM |
| | 3 | Australia | Shayna Jack (53.75) Bronte Campbell (52.14) Brittany Elmslie (53.83) Emma McKeon (52.29) | 3:32.01 | |
| | 5 | Netherlands | Kim Busch (54.05) Femke Heemskerk (52.84) Maud van der Meer (53.77) Ranomi Kromowidjojo (51.98) | 3:32.64 | |
| 4 | 2 | Canada | Sandrine Mainville (53.77) Chantal Van Landeghem (52.97) Kayla Sanchez (54.16) Penny Oleksiak (52.98) | 3:33.88 | |
| 5 | 6 | Sweden | Sarah Sjöström (51.71 WR) Michelle Coleman (52.68) Ida Lindborg (55.59) Louise Hansson (53.96) | 3:33.94 | NR |
| 6 | 7 | China | Zhu Menghui (53.79) Zhang Yufei (54.31) Wu Yue (54.96) Ai Yanhan (53.43) | 3:36.49 | |
| 7 | 1 | Japan | Rikako Ikee (54.59) Tomomi Aoki (54.45) Yui Yamane (54.62) Chihiro Igarashi (54.58) | 3:38.24 | |
| 8 | 8 | Denmark | Signe Bro (54.72) Sarah Bro (56.60) Emilie Beckmann (54.84) Pernille Blume (52.70) | 3:38.86 | |