The Women's 400 metre individual medley event at the 2013 Southeast Asian Games took place on 16 December 2013 at Wunna Theikdi Aquatics Centre.
There were 8 competitors from 5 countries who took part in this event. No Qualification was held since only 8 swimmers competed.
Swimming at the 2013 Southeast Asian Games – Women's 400 metre individual medley Wikipedia
All times are Myanmar Standard Time (UTC+06:30)
Prior to this competition, the existing world, Asian, and Southeast Asian Games records were as follows.