# Swimming at the 2018 Asian Games – Mixed 4 × 100 metre medley relay

The mixed 4 × 100 metre medley relay event at the 2018 Asian Games took place on 22 August at the Gelora Bung Karno Aquatic Stadium.

## Schedule

All times are Western Indonesia Time (UTC+07:00)
| Date | Time | Event |
| Wednesday, 22 August 2018 | 10:32 | Heats |
| Wednesday, 22 August 2018 | 19:50 | Final |

## Records

Prior to this competition, the existing world, Asian and Games records were as follows.
| World Record | United States | 3:38.56 | Budapest, Hungary | 26 July 2017 |
| Asian Record | Japan | 3:40.98 | Tokyo, Japan | 9 August 2018 |
| Games Record | — | — | — | — |

## Results
### Legend

* DNS — Did not start
* DSQ — Disqualified

### Heats

| Rank | Heat | Team | Time | Notes |
| 1 | 1 | Japan (JPN) | 3:48.89 | GR |
| | | Masaki Kaneko | 54.65 | |
| | | Ippei Watanabe | 1:00.34 | |
| | | Rikako Ikee | 58.16 | |
| | | Mayuka Yamamoto | 55.74 | |
| 2 | 2 | China (CHN) | 3:53.29 | |
| | | Li Guangyuan | 54.52 | |
| | | Shi Jinglin | 1:07.36 | |
| | | Zheng Xiaojing | 53.22 | |
| | | Yang Junxuan | 58.19 | |
| 3 | 1 | South Korea (KOR) | 3:55.46 | |
| | | Kang Ji-seok | 55.55 | |
| | | Kim Jae-youn | 1:02.96 | |
| | | Park Ye-rin | 1:00.34 | |
| | | Kim Min-ju | 56.61 | |
| 4 | 2 | Indonesia (INA) | 3:55.56 | |
| | | I Gede Siman Sudartawa | 55.41 | |
| | | Anandia Evato | 1:10.12 | |
| | | Glenn Victor Sutanto | 53.34 | |
| | | Patricia Yosita Hapsari | 56.69 | |
| 5 | 1 | Hong Kong (HKG) | 3:56.62 | |
| | | Lau Shiu Yue | 57.82 | |
| | | Kenneth To | 1:00.94 | |
| | | Chan Kin Lok | 1:01.38 | |
| | | Sze Hang Yu | 56.48 | |
| 6 | 2 | Chinese Taipei (TPE) | 3:58.31 | |
| | | Chuang Mu-lun | 56.55 | |
| | | Lee Hsuan-yen | 1:02.30 | |
| | | Huang Mei-chien | 1:01.63 | |
| | | Chen Yu-rong | 57.83 | |
| 7 | 2 | Singapore (SGP) | 3:59.87 | |
| | | Francis Fong | 57.05 | |
| | | Samantha Yeo | 1:10.86 | |
| | | Ong Jung Yi | 54.76 | |
| | | Marina Chan | 57.20 | |
| 8 | 2 | Thailand (THA) | 4:05.88 | |
| | | Kasipat Chograthin | 58.99 | |
| | | Saovanee Boonamphai | 1:12.84 | |
| | | Nuttapong Ketin | 56.77 | |
| | | Manita Sathianchokwisan | 57.28 | |
| 9 | 2 | Macau (MAC) | 4:07.29 | |
| | | Erica Vong | 1:06.61 | |
| | | Chao Man Hou | 1:02.43 | |
| | | Sio Ka Kun | 59.01 | |
| | | Tan Chi Yan | 59.24 | |
| 10 | 1 | Mongolia (MGL) | 4:22.76 | |
| | | Erdenemönkhiin Demüül | 1:03.28 | |
| | | Günsennorovyn Zandanbal | 1:08.95 | |
| | | Batbayaryn Enkhkhüslen | 1:07.78 | |
| | | Khuyagbaataryn Enkhzul | 1:02.75 | |
| 11 | 1 | Pakistan (PAK) | 4:31.25 | |
| | | Haseeb Tariq | 1:03.76 | |
| | | Muhammad Hamza Malik | 1:16.17 | |
| | | Mishael Aisha Ayub | 1:08.75 | |
| | | Bisma Khan | 1:02.57 | |
| 12 | 1 | Maldives (MDV) | 5:06.67 | |
| | | Aishath Sausan | 1:19.48 | |
| | | Aishath Sajina | 1:33.01 | |
| | | Mubal Azzam Ibrahim | 1:12.00 | |
| | | Ali Imaan | 1:02.18 | |
| — | 1 | Cambodia (CAM) | DNS | |
| — | 2 | Tajikistan (TJK) | DNS | |

### Final

| Rank | Team | Time | Notes |
| | China (CHN) | 3:40.45 | AR |
| | Xu Jiayu | 52.30 | |
| | Yan Zibei | 58.45 | |
| | Zhang Yufei | 56.61 | |
| | Zhu Menghui | 53.09 | |
| | Japan (JPN) | 3:41.21 | |
| | Ryosuke Irie | 52.55 | |
| | Yasuhiro Koseki | 58.95 | |
| | Rikako Ikee | 55.68 | |
| | Tomomi Aoki | 54.03 | |
| | South Korea (KOR) | 3:49.27 | |
| | Lee Ju-ho | 55.36 | |
| | Moon Jae-kwon | 1:00.71 | |
| | An Se-hyeon | 57.93 | |
| | Ko Mi-so | 55.27 | |
| 4 | Hong Kong (HKG) | 3:50.22 | |
| | Stephanie Au | 1:00.52 | |
| | Kenneth To | 1:00.63 | |
| | Nicholas Lim | 53.75 | |
| | Camille Cheng | 55.32 | |
| 5 | Indonesia (INA) | 3:55.37 | |
| | I Gede Siman Sudartawa | 55.14 | |
| | Anandia Evato | 1:10.31 | |
| | Glenn Victor Sutanto | 53.36 | |
| | Patricia Yosita Hapsari | 56.56 | |
| 6 | Chinese Taipei (TPE) | 3:58.30 | |
| | Chuang Mu-lun | 56.49 | |
| | Lee Hsuan-yen | 1:02.24 | |
| | Huang Mei-chien | 1:01.95 | |
| | Chen Yu-rong | 57.62 | |
| 7 | Thailand (THA) | 4:01.75 | |
| | Kasipat Chograthin | 58.19 | |
| | Nuttapong Ketin | 1:03.88 | |
| | Kornkarnjana Sapianchai | 1:01.87 | |
| | Manita Sathianchokwisan | 57.81 | |
| — | Singapore (SGP) | DSQ | |
| | Francis Fong | 56.12 | |
| | Lionel Khoo | 1:01.24 | |
| | Quah Jing Wen | 59.84 | |
| | Quah Ting Wen | | |