Swimming at the 2015 World Aquatics Championships – 4 × 100 metre mixed medley relay
The 4 × 100 metre mixed medley relay competition of the swimming events at the 2015 World Aquatics Championships was held on 5 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 |
| 5 August | Heats | 3:45.87 | CR | |
| 5 August | Heats | 3:42.33 | , CR | |
| 5 August | Final | 3:41.71 | , CR |
Results
Heats
The heats were held at 10:49.| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 3 | 2 | Ryan Murphy CR Kevin Cordes Kendyl Stewart Lia Neal | 3:42.33 | Q, | |
| 2 | 3 | 0 | Chris Walker-Hebborn Ross Murdoch Rachael Kelly Fran Halsall | 3:44.39 | Q | |
| 3 | 4 | 3 | Jan-Philip Glania Hendrik Feldwehr Alexandra Wenk Annika Bruhn | 3:45.39 | Q, NR | |
| 4 | 2 | 4 | Daria Ustinova Kirill Prigoda Daniil Pakhomov Veronika Popova | 3:45.87 | Q | |
| 5 | 3 | 7 | Simone Sabbioni Arianna Castiglioni Matteo Rivolta Erika Ferraioli | 3:46.03 | Q, NR | |
| 6 | 1 | 6 | Xu Jiayu Li Xiang Chen Xinyi Zhu Menghui | 3:47.48 | Q, AS | |
| 7 | 3 | 1 | Gábor Balog David Horvath Evelyn Verrasztó Zsuzsanna Jakabos | 3:49.50 | Q | |
| 8 | 4 | 9 | Russell Wood Rachel Nicol Noemie Thomas Karl Krug | 3:49.60 | Q | |
| 9 | 4 | 4 | Daynara de Paula Felipe Lima Daiene Dias João de Lucca | 3:53.45 | ||
| 10 | 3 | 5 | Nils Liess Martin Schweizer Danielle Villars Megan Connor | 3:53.56 | ||
| 11 | 1 | 4 | Mimosa Jallow Sami Aaltomaa Emilia Pikkarainen Ari-Pekka Liukkonen | 3:55.37 | ||
| 12 | 4 | 7 | Omar Pinzón Jorge Murillo Jessica Camposano Isabella Arcila | 3:55.42 | ||
| 13 | 4 | 6 | Quah Zheng Wen Ho Ru'En Roanne Quah Ting Wen Yeo Kai Quan | 3:57.51 | ||
| 14 | 2 | 8 | Lourdes Villaseñor Daniela Carrillo Daniel Ramirez Carranza Alejandro Escudero | 4:00.81 | ||
| 15 | 1 | 3 | Kasipat Chograthin Radomyos Matjiur Sutasinee Pankaew Jenjira Srisa-Ard | 4:07.19 | ||
| 16 | 2 | 3 | Boris Kirillov Anton Zheltyakov Alsu Bayramova Fatima Alkaramova | 4:07.93 | ||
| 17 | 2 | 0 | Mario Montoya Esteban Araya Marie Laura Meza Helena Moreno | 4:10.75 | ||
| 18 | 2 | 9 | Andrew Rutherfurd José Quintanilla Karen Torrez María José Ribera | 4:12.49 | ||
| 19 | 2 | 2 | Ryan Pini Tegan McCarthy Sam Seghers Barbara Vali-Skelton | 4:13.90 | ||
| 20 | 3 | 6 | Jade Howard Alex Axiotis Ralph Goveia Tilka Paljk | 4:14.40 | ||
| 21 | 4 | 0 | Ngou Pok Man Lei On Kei Chao Man Hou Long Chi Wai | 4.16.02 | ||
| 22 | 2 | 5 | Kimiko Raheem Machiko Raheem Matthew Abeysinghe Cherantha de Silva | 4:19.24 | ||
| 23 | 3 | 8 | Mohammed Bedour Lydia Musleh Khader Baqlah Talita Baqlah | 4:19.71 | ||
| 24 | 3 | 9 | Arianna Sanna Jean Luis Gómez Dorian McMenemy Jhonny Peréz | 4:19.79 | ||
| 25 | 4 | 1 | Talisa Lanoe Issa Mohamed Emily Muteti Hamdan Bayusuf | 4:23.99 | ||
| 26 | 4 | 5 | Enkhkhuslen Batbayar Delgerkhuu Myagmar Batsaikhan Dulguun Yesui Bayar | 4:34.46 | ||
| 2 | 7 | Ekaterina Avramova Viktoriya Zeynep Gunes Kaan Türker Ayar Kemal Arda Gürdal | ||||
| 3 | 4 | Benjamin Stasiulis Giacomo Perez-Dortona Marie Wattel Anna Santamans | ||||
| 1 | 2 | |||||
| 1 | 5 | |||||
| 2 | 1 | |||||
| 2 | 6 | |||||
| 3 | 3 | |||||
| 4 | 2 | |||||
| 4 | 8 |
Final
The final was held at 19:19.| Rank | Lane | Nation | Swimmers | Time | Notes |
| 5 | Chris Walker-Hebborn Adam Peaty Siobhan-Marie O'Connor Fran Halsall | 3:41.71 | |||
| 4 | Ryan Murphy Kevin Cordes Katie McLaughlin Margo Geer | 3:43.27 | |||
| 3 | Jan-Philip Glania Hendrik Feldwehr Alexandra Wenk Annika Bruhn | 3:44.13 | NR | ||
| 4 | 7 | Xu Jiayu Li Xiang Lu Ying Zhu Menghui | 3:44.65 | AS | |
| 5 | 6 | Anastasia Fesikova Yuliya Yefimova Daniil Pakhomov Vladimir Morozov | 3:44.83 | ||
| 6 | 2 | Simone Sabbioni Arianna Castiglioni Piero Codia Silvia Di Pietro | 3:45.59 | NR | |
| 7 | 8 | Russell Wood Richard Funk Katerine Savard Sandrine Mainville | 3:46.23 | ||
| 8 | 1 | Gábor Balog Dávid Horváth Evelyn Verrasztó Zsuzsanna Jakabos | 3:50.06 |