Swimming at the1959 SEAP Games was held inBangkok,Thailand. The competition featured 7 male events swum in along course (50m) pool.
| Event | Gold | Silver | Bronze | |||
|---|---|---|---|---|---|---|
| 100 m freestyle | Tin Maung Ni Burma (BIR) | 1:00.2 GR | Mya Thee Burma (BIR) | Tan Cheow Choon Singapore (SIN) | 1:00.9 | |
| 200 m freestyle | Tin Maung Ni Burma (BIR) | 2:17.7 GR | Mya Thee Burma (BIR) | 2:22.4 | Tan Cheow Choon Singapore (SIN) | 2:24.8 |
| 100 m backstroke | Lim Heng Chek Malaya (MAL) | 1:11.5 GR | Tat Thang Vietnam (VIE) | 1:15.1 | Tan Gek Kee Singapore (SIN) | 1:15.5 |
| 100 m breaststroke | Truong Ke Nhon Vietnam (VIE) | 1:20.6 GR | Seah Pong Pin Singapore (SIN) | 1:21.0 | Koay Thian Soon Malaya (MAL) | |
| 100 m butterfly | Lim Heng Chek Malaya (MAL) | 1:13.5 GR | Seah Pong Pin Singapore (SIN) | 1:13.7 | Phan Huu Dong Vietnam (VIE) | |
| 4×100 m freestyle relay | Singapore (SIN) | 4:14.4 GR | Burma (BIR) | 4:18.1 |  Thailand (THA) | 4:40.9 |
| 4×100 m medley relay | Vietnam (VIE) | 4:55.4 GR | Malaya (MAS) | Thailand (THA) | ||
| Rank | Nation | Gold | Silver | Bronze | Total |
|---|---|---|---|---|---|
| 1 | Burma (BIR) | 2 | 3 | 0 | 5 |
| 2 | Malaya (MAL) | 2 | 1 | 1 | 4 |
| Vietnam (VIE) | 2 | 1 | 1 | 4 | |
| 4 | Singapore (SIN) | 1 | 2 | 3 | 6 |
| 5 | Thailand (THA) | 0 | 0 | 2 | 2 |
| Totals (5 entries) | 7 | 7 | 7 | 21 | |