Swimming at the 2015 Southeast Asian Games – Women's 400 metre individual medley
# Swimming at the 2015 Southeast Asian Games – Women's 400 metre individual medley

The women's 400 metre individual medley competition of the swimming event at the 2015 Southeast Asian 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:

| Asian record | Ye Shiwen (CHN) | 4:28.43 | London, England | 28 July 2012 |
| - | - | - | - | - |
| Games record | Nguyễn Thị Ánh Viên (VIE) | 4:43.93 | Singapore | 6 June 2015 |

The following records were established during the competition:

| Date | Event | Name | Nationality | Time | Record |
| - | - | - | - | - | - |
| 6 June | Final | Nguyễn Thị Ánh Viên | Vietnam | 4:42.88 | GR |

## Schedule

| Date | Time | Event |
| - | - | - |
| Saturday, 6 June 2015 | 09:19 | Heat 1 |
| Saturday, 6 June 2015 | 09:24 | Heat 2 |
| Saturday, 6 June 2015 | 19:53 | Final |

## Results

| KEY: | q | Fastest non-qualifiers | Q | Qualified | GR | Games record | NR | National record | PB | Personal best | SB | Seasonal best |
| - | - | - | - | - | - | - | - | - | - | - | - | - |

### Heat 1

    Source: Results heat 1

The first round was held on 6 June.

| Rank | Lane | Athletes | Time | Notes |
| - | - | - | - | - |
| 1 | 5 | Dewi Ressa Kania (INA) | 5:03.14 | Q |
| 2 | 6 | Tan Jing-E (SIN) | 5:04.70 | Q |
| 3 | 3 | Dato Hannah (PHI) | 5:06.20 | Q |
| | 4 | Khoo Cai Lin (MAS) | DNF | |

### Heat 2

    Source: Results heat 2

The second round was held on 6 June.

| Rank | Lane | Athletes | Time | Notes |
| - | - | - | - | - |
| 1 | 4 | Nguyễn Thị Ánh Viên (VIE) | 4:43.93 | Q, GR |
| 2 | 5 | Pawapotako Phiangkhwan (THA) | 5:00.43 | Q |
| 3 | 6 | Quah Jing Wen (SIN) | 5:06.98 | Q |
| 4 | 3 | Nimdam Kanitta (THA) | 5:10.16 | Q |
| 5 | 2 | Oo Shun Lei Maw (MYA) | 5:35.56 | Q |

### Final

    Source: Results Final

The final was held on 6 June.

| Rank | Lane | Athletes | Time | Notes |
| - | - | - | - | - |
| | 4 | Nguyễn Thị Ánh Viên (VIE) | 4:42.88 | GR |
| | 5 | Pawapotako Phiangkhwan (THA) | 4:52.63 | |
| | 7 | Quah Jing Wen (SIN) | 4:59.52 | |
| 4 | 2 | Dato Hannah (PHI) | 5:00.96 | |
| 5 | 6 | Tan Jing-E (SIN) | 5:02.68 | |
| 6 | 1 | Nimdam Kanitta (THA) | 5:03.89 | |
| 7 | 3 | Dewi Ressa Kania (INA) | 5:04.46 | |
| 8 | 8 | Oo Shun Lei Maw (MYA) | 5:34.00 | |
