# Swimming at the 2015 World Aquatics Championships – 4 × 100 metre mixed freestyle relay

The 4 × 100 metre mixed freestyle relay competition of the swimming events at the 2015 World Aquatics Championships was held on 8 August with the heats and the final.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Australia | 3:23.29 | Perth, Australia | 01 February 2014 |
| Competition record | | | | |
The following new records were set during this competition
| Date | Event | Nation | Time | Record |
| 8 August | Final | United States | 3:23.05 | WR, CR |

## Results
### Heats

The heats were held at 10:24.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 3 | 3 | United States | Conor Dwyer (49.47) Ryan Lochte (48.43) Margo Geer (53.12) Abbey Weitzeil (53.49) | 3:24.51 | Q, AM |
| 2 | 4 | 4 | Russia | Andrey Grechin (49.21) Nikita Lobintsev (47.97) Veronika Popova (54.00) Nataliya Lovtsova (54.05) | 3:25.23 | Q |
| 3 | 3 | 5 | Italy | Luca Dotto (49.30) Filippo Magnini (48.60) Federica Pellegrini (54.35) Erika Ferraioli (53.98) | 3:26.23 | Q |
| 4 | 3 | 4 | Sweden | Christoffer Carlsen (49.78) Simon Sjödin (49.70) Michelle Coleman (53.35) Louise Hansson (53.77) | 3:26.60 | Q, NR |
| 5 | 3 | 0 | Netherlands | Sebastiaan Verschuren (49.49) Kyle Stolk (49.44) Marrit Steenbergen (55.29) Femke Heemskerk (52.69) | 3:26.91 | Q, NR |
| 6 | 2 | 7 | China | Yu Hexin (49.82) Lin Yongqing (49.29) Qiu Yuhan (53.87) Tang Yuting (54.73) | 3:27.71 | Q |
| 7 | 2 | 4 | Canada | Yuri Kisil (49.36) Karl Krug (49.20) Sandrine Mainville (54.22) Victoria Poon (54.97) | 3:27.75 | Q |
| 7 | 2 | 5 | Brazil | Matheus Santana (49.82) Marcelo Chierighini (48.43) Larissa Oliveira (54.89) Daynara de Paula (54.61) | 3:27.75 | Q, SA |
| 9 | 4 | 2 | France | Lorys Bourelly (49.94) Clément Mignon (48.20) Cloé Hache (55.33) Margaux Fabre (54.82) | 3:28.29 | |
| 10 | 2 | 1 | Japan | Yuki Kobori (49.69) Naito Ehara (49.90) Rikako Ikee (54.31) Misaki Yamaguchi (54.64) | 3:28.54 | |
| 11 | 3 | 8 | Germany | Christoph Fildebrandt (49.08) Marco di Carli (48.93) Alexandra Wenk (55.03) Marlene Hüther (55.95) | 3:28.99 | NR |
| 12 | 3 | 2 | Turkey | Doğa Çelik (50.30) Kemal Arda Gürdal (49.23) Ekaterina Avramova (56.21) Gizem Bozkurt (57.37) | 3:33.11 | |
| 13 | 4 | 7 | Singapore | Yeo Kai Quan (51.43) Amanda Lim (57.68) Quah Ting Wen (56.08) Quah Zheng Wen (49.39) | 3:34.58 | |
| 14 | 1 | 5 | Switzerland | Lukas Räuftlin (51.25) Jean-Baptiste Febo (50.76) Noemi Girardet (56.70) Maria Ugolkova (56.01) | 3:34.72 | |
| 15 | 4 | 1 | Luxembourg | Julien Henx (50.99) Pit Brandenburger (50.85) Julie Meynen (55.51) Monique Olivier (57.84) | 3:35.19 | |
| 16 | 2 | 2 | Serbia | Andrej Barna (51.21) Uroš Nikolić (50.24) Miroslava Najdanovski (57.98) Anja Crevar (59.23) | 3:38.66 | |
| 17 | 4 | 6 | FINA Independent Athletes | Matthew Abeysinghe (51.47) Machiko Raheem (59.94) Cherantha de Silva (52.60) Kimiko Raheem (58.93) | 3:42.94 | |
| 18 | 4 | 8 | Dominican Republic | Jhonny Pérez (52.85) Arianna Sanna (59.04) Dorian McMenemy (58.98) Jean Luis Gómez (52.98) | 3:43.85 | |
| 19 | 1 | 4 | Costa Rica | Marie Meza (59.09) Esteban Araya (54.55) Helena Moreno (1:00.10) Mario Montoya (52.42) | 3:46.16 | |
| 20 | 4 | 5 | Bolivia | Andrew Rutherfurd (52.37 NR) Maria José Ribera (1:01.73) Karen Torrez (57.96) Aldo Castillo (54.40) | 3:46.46 | |
| 21 | 2 | 6 | Jordan | Khader Baqlah (51.81) Mohammed Bedour (53.73) Rahaf Baqleh (1:02.21) Talita Baqlah (59.59) | 3:47.34 | |
| 22 | 2 | 8 | Mozambique | Denílson da Costa (55.03) Jannah Sonnenschein (1:00.94) Jessika Cossa (59.86) Igor Mogne (51.77) | 3:47.60 | |
| 23 | 4 | 3 | Macau | Chao Man Hou (52.92) Long Chi Wai (1:01.63) Ngou Pok Man (53.28) Lei On Kei (1:00.97) | 3:48.80 | |
| 24 | 2 | 3 | Kenya | Emily Muteti (1:01.03) Hamdan Bayusuf (56.38) Talisa Lanoe (1:01.96) Issa Mohamed (53.49) | 3:52.86 | |
| 25 | 3 | 6 | Armenia | Vahan Mkhitaryan (53.85) Monika Vasilyan (1:03.33) Ani Poghosyan (1:01.29) Vladimir Mamikonyan (54.49) | 3:52.96 | |
| 26 | 3 | 9 | Mongolia | Yesui Bayar (1:11.46) Batsaikhan Dulguun (55.65) Enkhkhuslen Batbayar (1:05.69) Delgerkhuu Myagmar (56.05) | 4:08.85 | |
| | 2 | 0 | Tajikistan | Anastasiya Tyurina (59.88) Karina Klimyk (1:05.82) Olim Kurbanov (1:11.96) Ramziyor Khorkashov (DSQ) | | DSQ |
| | 4 | 0 | Papua New Guinea | Ryan Pini (50.86) Tegan McCarthy (1:06.05) Barbara Vali-Skelton (1:04.02) Sam Seghers (DSQ) | | DSQ |
| | 1 | 3 | Albania | | | DNS |
| | 3 | 1 | Australia | | | DNS |
| | 3 | 7 | Mexico | | | DNS |

### Final

The final was held on 8 August at 19:17.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Ryan Lochte (48.79) Nathan Adrian (47.29) Simone Manuel (53.66) Missy Franklin (53.31) | 3:23.05 | WR |
| | 2 | Netherlands | Sebastiaan Verschuren (48.74) Joost Reijns (49.09) Ranomi Kromowidjojo (52.48) Femke Heemskerk (52.79) | 3:23.10 | EU |
| | 1 | Canada | Santo Condorelli (48.19) Yuri Kisil (48.25) Chantal van Landeghem (53.60) Sandrine Mainville (53.55) | 3:23.59 | |
| 4 | 5 | Russia | Vladimir Morozov (48.27) Alexandr Sukhorukov (47.74) Veronika Popova (53.72) Nataliya Lovtsova (54.48) | 3:24.21 | |
| 5 | 3 | Italy | Marco Orsi (48.70) Filippo Magnini (48.19) Federica Pellegrini (54.26) Erika Ferraioli (54.11) | 3:25.26 | |
| 6 | 8 | Brazil | Matheus Santana (48.96) Bruno Fratus (47.83) Larissa Oliveira (54.15) Daynara de Paula (54.64) | 3:25.58 | SA |
| 7 | 7 | China | Yu Hexin (49.70) Lin Yongqing (49.06) Qiu Yuhan (53.83) Tang Yuting (54.35) | 3:26.94 | AS |
| 8 | 6 | Sweden | Christoffer Carlsen (50.03) Simon Sjödin (49.67) Michelle Coleman (53.41) Louise Hansson (53.98) | 3:27.09 | |