The Women's 4 x 100 metre medley relay event at the 2013 SEA Games took place on 13 December 2013 at Wunna Theikdi Aquatics Centre.
There were 5 teams who took part in this event. Singapore won the gold medal, Thailand and Malaysia won the silver and bronze medal respectively.
All times are Myanmar Standard Time
| width=220 | Date | width=50 | Time | width=100 | Event |
|---|---|---|---|---|---|
| Sunday, 15 December 2013 | 19:04 | Final |
| width=40 | Rank | width=40 | Lane | width=250 | Team | width=80 | Time | width=50 | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 6 | 4:13.02 | ||||||||
| 1:03.56 | |||||||||
| 1:12.42 | |||||||||
| 1:00.84 | |||||||||
| 56.20 | |||||||||
| 2 | 4:15.52 | ||||||||
| 1:04.77 | |||||||||
| 1:11.98 | |||||||||
| 1:02.05 | |||||||||
| 56.72 | |||||||||
| 5 | 4:17.77 | ||||||||
| 1:07.90 | |||||||||
| 1:09.94 | |||||||||
| 1:00.84 | |||||||||
| 59.09 | |||||||||
| 4 | 4 | 4:20.96 | |||||||
| 1:05.36 | |||||||||
| 1:13.48 | |||||||||
| 1:02.73 | |||||||||
| 59.39 | |||||||||
| 5 | 3 | 4:50.05 | |||||||
| 1:15.32 | |||||||||
| 1:20.99 | |||||||||
| 1:08.68 | |||||||||
| 1:05.06 |