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

All times are Western Indonesia Time (UTC+07:00)

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

Legend

• DSQ — Disqualified

Heats

Rank	Heat	Team	Time	Notes
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