Swimming at the 2003 SEA Games
The Swimming competition at the 22nd SEA Games was held December 1–10, 2003 in My Dinh Aquatics Centre, Hanoi, Vietnam. The competition featured 38 events (19 male, 19 female) swum in a long course (50m) pool.
Medal summary
Medal table
Men's events
| Event | Gold | Silver | Bronze | |||
|---|---|---|---|---|---|---|
| 50 m freestyle |  Arwut Chinnapasaen (THA) |
23.33 |  Allen Ong (MAS) |
23.69 |  Richard Sam Bera (IDN) |
23.73 |
| 100 m freestyle | Allen Ong (MAS) |
51.57 |  Mark Chay (SIN) |
51.96 |  Miguel Molina (PHI) |
52.85 |
| 200 m freestyle | Miguel Molina (PHI) |
1:52.89 | Tan Lee Yu Gary (SIN) |
1:53.58 | Daniel Bego (MAS) |
1:55.36 |
| 400 m freestyle | Charnvudth Saengsri (THA) |
3:59.91 | Miguel Mendoza (PHI) |
4:03.54 | Miguel Molina (PHI) |
4:05.12 |
| 1500 m freestyle | Miguel Mendoza (PHI) |
12:43.54 | Charnvudth Saengsri (THA) |
15:56.22 | Saw Yi Khy (MAS) |
|
| 100 m backstroke | Alex Lim (MAS) |
57.51 | Mark Chay (SIN) |
59.14 | Suriya Sulsuphak (THA) |
59.80 |
| 200 m backstroke | Alex Lim (MAS) |
2:04.11 |  Trương Ngọc Tuấn (VIE) |
2:08.00 | Suriya Sulsuphak (THA) |
2:09.51 |
| 100 m breaststroke | Ratapong Sirisanont (THA) |
1:03.13 | Vorrawuti Aumpiwan (THA) |
1:03.94 | Nguyễn Hữu Việt (VIE) |
1:04.77 |
| 200 m breaststroke | Ratapong Sirisanont (THA) |
2:16.67 | Vorrawuti Aumpiwan (THA) |
2:18.18 | Miguel Molina (PHI) |
2:20.81 |