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.The following new records were set during this competition
| Date | Event | Nation | Time | Record |
| 8 August | Final | 3:23.05 | , CR |
Results
Heats
The heats were held at 10:24.| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 3 | 3 | Conor Dwyer Ryan Lochte Margo Geer Abbey Weitzeil | 3:24.51 | Q, AM | |
| 2 | 4 | 4 | Andrey Grechin Nikita Lobintsev Veronika Popova Nataliya Lovtsova | 3:25.23 | Q | |
| 3 | 3 | 5 | Luca Dotto Filippo Magnini Federica Pellegrini Erika Ferraioli | 3:26.23 | Q | |
| 4 | 3 | 4 | Christoffer Carlsen Simon Sjödin Michelle Coleman Louise Hansson | 3:26.60 | Q, NR | |
| 5 | 3 | 0 | Sebastiaan Verschuren Kyle Stolk Marrit Steenbergen Femke Heemskerk | 3:26.91 | Q, NR | |
| 6 | 2 | 7 | Yu Hexin Lin Yongqing Qiu Yuhan Tang Yuting | 3:27.71 | Q | |
| 7 | 2 | 4 | Yuri Kisil Karl Krug Sandrine Mainville Victoria Poon | 3:27.75 | Q | |
| 7 | 2 | 5 | Matheus Santana Marcelo Chierighini Larissa Oliveira Daynara de Paula | 3:27.75 | Q, SA | |
| 9 | 4 | 2 | Lorys Bourelly Clément Mignon Cloé Hache Margaux Fabre | 3:28.29 | ||
| 10 | 2 | 1 | Yuki Kobori Naito Ehara Rikako Ikee Misaki Yamaguchi | 3:28.54 | ||
| 11 | 3 | 8 | Christoph Fildebrandt Marco di Carli Alexandra Wenk Marlene Hüther | 3:28.99 | NR | |
| 12 | 3 | 2 | Doğa Çelik Kemal Arda Gürdal Ekaterina Avramova Gizem Bozkurt | 3:33.11 | ||
| 13 | 4 | 7 | Yeo Kai Quan Amanda Lim Quah Ting Wen Quah Zheng Wen | 3:34.58 | ||
| 14 | 1 | 5 | Lukas Räuftlin Jean-Baptiste Febo Noemi Girardet Maria Ugolkova | 3:34.72 | ||
| 15 | 4 | 1 | Julien Henx Pit Brandenburger Julie Meynen Monique Olivier | 3:35.19 | ||
| 16 | 2 | 2 | Andrej Barna Uroš Nikolić Miroslava Najdanovski Anja Crevar | 3:38.66 | ||
| 17 | 4 | 6 | FINA Independent Athletes | Matthew Abeysinghe Machiko Raheem Cherantha de Silva Kimiko Raheem | 3:42.94 | |
| 18 | 4 | 8 | Jhonny Peréz Arianna Sanna Dorian McMenemy Jean Luis Gómez | 3:43.85 | ||
| 19 | 1 | 4 | Marie Meza Esteban Araya Helena Moreno Mario Montoya | 3:46.16 | ||
| 20 | 4 | 5 | Andrew Rutherfurd Maria José Ribera Karen Torrez Aldo Castillo | 3:46.46 | ||
| 21 | 2 | 6 | Khader Baqlah Mohammed Bedour Rahaf Baqleh Talita Baqlah | 3:47.34 | ||
| 22 | 2 | 8 | Denílson da Costa Jannah Sonnenschein Jessika Cossa Igor Mogne | 3:47.60 | ||
| 23 | 4 | 3 | Chao Man Hou Long Chi Wai Ngou Pok Man Lei On Kei | 3:48.80 | ||
| 24 | 2 | 3 | Emily Muteti Hamdan Bayusuf Talisa Lanoe Issa Mohamed | 3:52.86 | ||
| 25 | 3 | 6 | Vahan Mkhitaryan Monika Vasilyan Ani Poghosyan Vladimir Mamikonyan | 3:52.96 | ||
| 26 | 3 | 9 | Yesui Bayar Batsaikhan Dulguun Enkhkhuslen Batbayar Delgerkhuu Myagmar | 4:08.85 | ||
| 2 | 0 | Anastasiya Tyurina Karina Klimyk Olim Kurbanov Ramziyor Khorkashov | DSQ | |||
| 4 | 0 | Ryan Pini Tegan McCarthy Barbara Vali-Skelton Sam Seghers | DSQ | |||
| 1 | 3 | DNS | ||||
| 3 | 1 | DNS | ||||
| 3 | 7 | DNS |
Final
The final was held on 8 August at 19:17.| Rank | Lane | Nation | Swimmers | Time | Notes |
| 4 | Ryan Lochte Nathan Adrian Simone Manuel Missy Franklin | 3:23.05 | |||
| 2 | Sebastiaan Verschuren Joost Reijns Ranomi Kromowidjojo Femke Heemskerk | 3:23.10 | EU | ||
| 1 | Santo Condorelli Yuri Kisil Chantal van Landeghem Sandrine Mainville | 3:23.59 | |||
| 4 | 5 | Vladimir Morozov Alexandr Sukhorukov Veronika Popova Nataliya Lovtsova | 3:24.21 | ||
| 5 | 3 | Marco Orsi Filippo Magnini Federica Pellegrini Erika Ferraioli | 3:25.26 | ||
| 6 | 8 | Matheus Santana Bruno Fratus Larissa Oliveira Daynara de Paula | 3:25.58 | SA | |
| 7 | 7 | Yu Hexin Lin Yongqing Qiu Yuhan Tang Yuting | 3:26.94 | AS | |
| 8 | 6 | Christoffer Carlsen Simon Sjödin Michelle Coleman Louise Hansson | 3:27.09 |