# Swimming at the 2017 World Aquatics Championships – 4 × 100 metre mixed medley relay

The 4 × 100 metre mixed medley relay competition at the 2017 World Championships was held on 26 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Great Britain | 3:41.71 | Kazan, Russia | 5 August 2015 |
| Competition record | Great Britain | 3:41.71 | Kazan, Russia | 5 August 2015 |
The following new records were set during this competition
| Date | Event | Nation | Time | Record |
| 26 July | Heat | United States | 3:40.28 | WR, CR |
| 26 July | Final | United States | 3:38.56 | WR, CR |

## Results
### Heats

The heats were held at 10:52.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 2 | United States | Ryan Murphy (52.34) Kevin Cordes (58.95) Kelsi Worrell (56.17) Mallory Comerford (52.82) | 3:40.28 | Q, WR |
| 2 | 4 | 9 | Australia | Kaylee McKeown (1:00.03) Matthew Wilson (59.69) Grant Irvine (51.09) Shayna Jack (53.32) | 3:44.13 | Q, OC |
| 3 | 2 | 6 | Canada | Javier Acevedo (54.44) Richard Funk (59.04) Rebecca Smith (57.57) Chantal van Landeghem (53.41) | 3:44.46 | Q |
| 4 | 4 | 4 | Great Britain | Georgia Davies (59.54) Ross Murdoch (59.49) James Guy (51.12) Freya Anderson (54.64) | 3:44.79 | Q |
| 5 | 3 | 5 | Russia | Kliment Kolesnikov (53.48) Vsevolod Zanko (59.69) Svetlana Chimrova (58.25) Viktoriya Andreyeva (54.67) | 3:46.09 | Q |
| 6 | 1 | 4 | China | Li Guangyuan (53.65) Shi Jinglin (1:06.87) Li Zhuhao (52.01) Zhu Menghui (53.72) | 3:46.25 | Q |
| 7 | 3 | 4 | Italy | Margherita Panziera (1:01.03) Nicolò Martinenghi (1:00.26) Piero Codia (51.91) Silvia Di Pietro (53.55) | 3:46.75 | Q |
| 8 | 2 | 1 | Germany | Lisa Graf (1:00.69) Christian vom Lehn (1:00.53) Aliena Schmidtke (57.70) Marius Kusch (48.74) | 3:47.66 | Q |
| 9 | 4 | 3 | Argentina | Andrea Berrino (1:01.78) Macarena Ceballos (1:09.51) Santiago Grassi (52.65) Federico Grabich (48.55) | 3:52.49 | |
| 10 | 1 | 3 | Japan | Junya Koga (53.88) Runa Imai (1:09.30) Sakiko Shimizu (59.72) Tsubasa Amai (50.79) | 3:53.79 | |
| 11 | 3 | 9 | Mexico | Fernanda González (1:02.72) Miguel de Lara (1:01.36) Daniel Ramírez (54.13) Liliana Ibáñez (56.53) | 3:54.74 | |
| 12 | 2 | 4 | Estonia | Sigrid Sepp (1:03.06) Maria Romanjuk (1:09.02) Kregor Zirk (53.37) Daniel Zaitsev (50.49) | 3:55.94 | |
| 13 | 2 | 8 | Slovakia | Katarína Listopadová (1:01.68) Tomáš Klobučník (1:01.48) Barbora Mišendová (1:01.53) Richard Nagy (52.09) | 3:56.78 | |
| 14 | 4 | 6 | South Africa | Martin Binedell (56.17) Kaylene Corbett (1:10.76) Clayton Jimmie (54.67) Erin Gallagher (55.42) | 3:57.02 | |
| 15 | 3 | 8 | Latvia | Kristina Steina (1:05.10) Daniils Bobrovs (1:02.65) Nikolajs Maskaļenko (56.27) Gabriela Ņikitina (56.68) | 4:00.70 | |
| 16 | 3 | 7 | Philippines | Nicole Oliva (1:07.02) James Deiparine (1:02.54) Jessie Lacuna (56.60) Jasmine Al-Khaldi (56.95) | 4:03.11 | |
| 17 | 2 | 3 | Moldova | Tatiana Salcutan (1:02.22) Alina Bulmag (1:10.26) Pavel Izbisciuc (57.07) Evghenii Paponin (55.49) | 4:05.04 | |
| 18 | 3 | 2 | Kenya | Steven Maina (1:00.54) Rebecca Kamau (1:12.80) Emily Muteti (1:02.92) Issa Mohamed (52.58) | 4:08.84 | |
| 19 | 4 | 2 | Faroe Islands | Signhild Joensen (1:04.10) Róland Toftum (1:06.63) Óli Mortensen (58.62) Sára Ryggshamar Nysted (1:00.94) | 4:10.29 | |
| 20 | 4 | 7 | Angola | Catarina Sousa (1:10.80) Mario Ervedosa (1:05.07) Daniel Francisco (59.77) Ana Sofia Nóbrega (1:00.04) | 4:15.68 | |
| 21 | 4 | 0 | Aruba | Mikel Schreuders (1:03.75) Jordy Groters (1:04.35) Daniella van den Berg (1:09.24) Allyson Ponson (59.35) | 4:16.69 | |
| 22 | 3 | 6 | Maldives | Mubal Azzam Ibrahim (1:17.92) Sajina Aishath (1:31.53) Ismail Muthasim Adnan (1:09.07) Aminath Shajan (1:08.83) | 5:07.35 | |
| | | | Hungary | Gábor Balog (54.67) Dániel Gyurta (DSQ) Liliána Szilágyi Zsuzsanna Jakabos | DSQ | DSQ |
| | | | Sweden | Ida Lindborg (1:01.50) Johannes Skagius (1:00.42) Louise Hansson (DSQ) Victor Johansson | DSQ | DSQ |
| | 1 | 5 | Seychelles | Alexus Laird Adam Moncherry Felicity Passon Dean Hoffman | DNS | DNS |
| | 2 | 5 | Israel | DNS | DNS | DNS |
| | 2 | 7 | Madagascar | DNS | DNS | DNS |
| | 3 | 0 | Mozambique | DNS | DNS | DNS |
| | 3 | 1 | Sri Lanka | DNS | DNS | DNS |
| | 3 | 3 | Egypt | DNS | DNS | DNS |
| | 4 | 1 | Finland | DNS | DNS | DNS |

### Final

The final was held at 19:19.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Matt Grevers (52.32) Lilly King (1:04.15) Caeleb Dressel (49.92) Simone Manuel (52.17) | 3:38.56 | WR |
| | 5 | Australia | Mitch Larkin (53.11) Daniel Cave (59.29) Emma McKeon (56.51) Bronte Campbell (52.30) | 3:41.21 | OC |
| | 3 | Canada | Kylie Masse (58.22) Richard Funk (59.14) Penny Oleksiak (56.18) Yuri Kisil (47.71) | 3.41.25 | NR |
| | 7 | China | Xu Jiayu (52.37) Yan Zibei (58.98) Zhang Yufei (56.98) Zhu Menghui (52.92) | 3:41.25 | AS |
| 5 | 6 | Great Britain | Georgia Davies (59.98) Adam Peaty (57.12) James Guy (50.51) Siobhan-Marie O'Connor (53.95) | 3:41.56 | ER |
| 6 | 2 | Russia | Grigoriy Tarasevich (53.35) Kirill Prigoda (58.64) Svetlana Chimrova (57.18) Veronika Popova (53.85) | 3:43.02 | NR |
| 7 | 8 | Germany | Lisa Graf (1:00.55) Marco Koch (59.89) Aliena Schmidtke (57.29) Damian Wierling (48.30) | 3:46.03 | |
| 8 | 1 | Italy | Matteo Milli (54.24) Nicolò Martinenghi (59.61) Ilaria Bianchi (57.25) Federica Pellegrini (55.23) | 3.46.33 | |