# Swimming at the 2018 Asian Games – Women's 4 × 100 metre medley relay

The women's 4 × 100 metre medley relay event at the 2018 Asian Games took place on 23 August at the Gelora Bung Karno Aquatic Stadium.

## Schedule

All times are Western Indonesia Time (UTC+07:00)
| Date | Time | Event |
| Thursday, 23 August 2018 | 10:03 | Heats |
| Thursday, 23 August 2018 | 19:17 | Final |

## Records

Prior to this competition, the existing world, Asian and Games records were as follows.
| World Record | United States | 3:51.55 | Budapest, Hungary | 30 July 2017 |
| Asian Record | China | 3:52.19 | Rome, Italy | 1 August 2009 |
| Games Record | China | 3:57.80 | Guangzhou, China | 13 November 2010 |

## Results
### Legend

* DSQ — Disqualified

### Heats

| Rank | Heat | Team | Time |
| 1 | 2 | Japan (JPN) | 4:01.65 |
| | | Anna Konishi | 59.72 |
| | | Reona Aoki | 1:06.63 |
| | | Ai Soma | 58.39 |
| | | Sakiko Shimizu | 56.91 |
| 2 | 1 | China (CHN) | 4:02.67 |
| | | Fu Yuanhui | 1:00.90 |
| | | Yu Jingyao | 1:07.67 |
| | | Lin Xintong | 59.30 |
| | | Yang Junxuan | 54.80 |
| 3 | 1 | South Korea (KOR) | 4:10.94 |
| | | Shin Young-yeon | 1:02.88 |
| | | Back Su-yeon | 1:09.50 |
| | | Park Ye-rin | 1:00.74 |
| | | Kim Min-ju | 57.82 |
| 4 | 2 | Singapore (SGP) | 4:12.73 |
| | | Hoong En Qi | 1:04.43 |
| | | Samantha Yeo | 1:10.95 |
| | | Quah Jing Wen | 1:00.92 |
| | | Cherlyn Yeoh | 56.43 |
| 5 | 2 | Hong Kong (HKG) | 4:15.99 |
| | | Toto Wong | 1:02.38 |
| | | Rainbow Ip | 1:11:22 |
| | | Sze Hang Yu | 1:03.38 |
| | | Tam Hoi Lam | 59.01 |
| 6 | 1 | Indonesia (INA) | 4:18.94 |
| | | Nurul Fajar Fitriyati | 1:04.17 |
| | | Anandia Evato | 1:11.86 |
| | | Azzahra Permatahani | 1:02.78 |
| | | Sofie Kemala Fatiha | 1:00.13 |
| 7 | 2 | Thailand (THA) | 4:21.61 |
| | | Araya Wongvat | 1:05.91 |
| | | Saovanee Boonamphai | 1:12.68 |
| | | Kornkarnjana Sapianchai | 1:03.17 |
| | | Natthanan Junkrajang | 59.85 |
| 8 | 1 | Macau (MAC) | 4:26.07 |
| | | Erica Vong | 1:05.49 |
| | | Cheang Weng Lam | 1:14.88 |
| | | Tan Chi Yan | 1:06.69 |
| | | Lei On Kei | 59.01 |
| 9 | 2 | Mongolia (MGL) | 4:52.13 |
| | | Bayaryn Yesüi | 1:14.69 |
| | | Temüüjingiin Amingoo | 1:25.63 |
| | | Batbayaryn Enkhkhüslen | 1:08.25 |
| | | Khuyagbaataryn Enkhzul | 1:03.56 |
| 10 | 1 | Maldives (MDV) | 5:42.33 |
| | | Aishath Sausan | 1:19.85 |
| | | Aishath Hulva Khulail | 1:35.74 |
| | | Anmau Ahmed Saleem | 1:29.42 |
| | | Aishath Sajina | 1:17.32 |

### Final

| Rank | Team | Time | Notes |
| | Japan (JPN) | 3:54.73 | GR |
| | Natsumi Sakai | 59.42 | |
| | Satomi Suzuki | 1:05.43 | |
| | Rikako Ikee | 55.80 | |
| | Tomomi Aoki | 54.08 | |
| | Hong Kong (HKG) | 4:03.15 | |
| | Stephanie Au | 1:00.38 | |
| | Jamie Yeung | 1:08.16 | |
| | Chan Kin Lok | 59.76 | |
| | Camille Cheng | 54.85 | |
| | Singapore (SGP) | 4:09.65 | |
| | Hoong En Qi | 1:04.06 | |
| | Samantha Yeo | 1:10.82 | |
| | Quah Jing Wen | 58.75 | |
| | Quah Ting Wen | 56.02 | |
| 4 | Indonesia (INA) | 4:11.63 | |
| | Nurul Fajar Fitriyati | 1:03.41 | |
| | Anandia Evato | 1:09.75 | |
| | Adinda Larasati Dewi | 1:01.45 | |
| | Patricia Yosita Hapsari | 57.02 | |
| 5 | Thailand (THA) | 4:18.19 | |
| | Araya Wongvat | 1:05.67 | |
| | Saovanee Boonamphai | 1:14.35 | |
| | Kornkarnjana Sapianchai | 1:00.91 | |
| | Natthanan Junkrajang | 57.26 | |
| 6 | Macau (MAC) | 4:25.14 | |
| | Erica Vong | 1:05.07 | |
| | Cheang Weng Lam | 1:14.21 | |
| | Tan Chi Yan | 1:05.21 | |
| | Lei On Kei | 1:00.65 | |
| — | China (CHN) | DSQ | |
| | Chen Jie | 1:01.06 | |
| | Shi Jinglin | 1:06.40 | |
| | Zhang Yufei | | |
| | Zhu Menghui | | |
| — | South Korea (KOR) | DSQ | |
| | Im Da-sol | 1:01.35 | |
| | Kim Hye-jin | 1:07.59 | |
| | An Se-hyeon | 57.32 | |
| | Ko Mi-so | | |