Swimming at the 2015 SEA Games – Women's 400 metre individual medley

The women's 400 metre individual medley competition of the swimming event at the 2015 SEA Games was held on 6 June at the OCBC Aquatic Centre in Kallang, Singapore.

Records
Prior to this competition, the existing Asian and Games records were as follows:

The following records were established during the competition:

Heat 1

 * Source: Results heat 1

The first round was held on 6 June.

Heat 2

 * Source: Results heat 2

The second round was held on 6 June.

Final

 * Source: Results Final

The final was held on 6 June.