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

The men's 400 metre individual medley competition of the swimming event at the 2015 SEA Games was held on 9 June at the OCBC Aquatic Centre in Kallang, Singapore.

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

Final

 * Source: Results Final

The final was held on 9 June.