| Event: | Aquatics |
| Games: | 1969 |
| Prev: | 1967 |
| Next: | 1971 |
Aquatics at the 1969 Southeast Asian Peninsular Games included swimming, diving, and waterpolo events. The sports of aquatics were held in Rangoon, Burma. Aquatics events was held between 10 December to 13 December.
| 100 m freestyle |  Tan Thuan Heng | 57.4 |  Ohn Thwin | Nanda Kyaw Zwa | |||
| 200 m freestyle | Tan Thuan Heng | 2:06.4 | Ohn Thwin | 2:10.2 |  Lim Cheik Sung | 2:13.6 | |
| 400 m freestyle | Tan Thuan Heng | 4:38.6 | Lim Cheik Sung | 4:45.1 | Poh Thaw Dar | 4:45.6 | |
| 1500 m freestyle | Alex Chan | 19:02.1 | Roy Chan | 19:08.6 | Lim Cheik Sung | 19:16.7 | |
| 100 m backstroke | Alex Chan | 1:06.8 | Roy Chan | 1:08.6 | Ohn Thwin | 1:08.9 | |
| 200 m backstroke | Alex Chan | 2:27.8 | Roy Chan | 2:29.1 | Nanda Kyaw Zwa | ||
| 100 m breaststroke | Maung Kyi | 1:15.4 |  Somchai Purgchaipaew | 1:16.3 | Joseph Yow | 1:17.1 | |
| 200 m breaststroke | Somchai Purgchaipaew | Joseph Yow | 2:52.0 | Phone Myat Thu | 2:52.7 | ||
| 100 m butterfly | Nanda Kyaw Zwa | 1:02.3 | Aung Hlain Win | Vichian Magtanaroong | |||
| 200 m butterfly | Nanda Kyaw Zwa | 2:21.3 | Alex Chan | 2:21.5 | Vichian Magtanaroong | ||
| 400 m individual medley | Alex Chan | 5:12.2 | Roy Chan | 5:19.4 | Nanda Kyaw Zwa | 5:24.3 | |
| 4 × 100 m freestyle relay | Singapore | 3:54.9 | Burma | 3:55.4 | Thailand | 4:02.1 | |
| 4 × 200 m freestyle relay | Singapore | 8:45.8 | Burma | 8:47.7 | Thailand | 9:25.2 | |
| 4 × 100 m medley relay | Burma | 4:18.1 | Singapore | 4:19.6 | Thailand | 4:20.8 | |
| 100 m freestyle | Patricia Chan | 1:05.9 | Tay Chin Joo | 1:07.5 | Marlar | 1:08.7 | |
| 200 m freestyle | Patricia Chan | 2:25.6 | Marlar | 2:31.3 | Molly Tay Chin Say | 2:31.3 | |
| 400 m freestyle | Patricia Chan | 5:01.7 | Sidney M. Keenan | 5:14.6 | Marlar | 5:24.8 | |
| 100 m backstroke | Patricia Chan | 1:13.9 | Molly Tay Chin Say | 1:17.8 | Ong Mei Lin | 1:18.2 | |
| 200 m backstroke | Patricia Chan | 2:38.9 | Molly Tay Chin Say | 2:49.0 | Ong Mei Lin | 2:49.6 | |
| 100 m breaststroke | Chintana Thongratana | 1:24.6 | Esther Tan | 1:26.8 | Polly Ba San | ||
| 200 m breaststroke | Chintana Thongratana | Polly Ba San | Esther Tan | 3:07.2 | |||
| 100 m butterfly | Patricia Chan | 1:11.4 | Tay Chin Joo | 1:14.8 | Ong Mei Lin | 1:20.0 | |
| 200 m butterfly | Patricia Chan | 2:39.1 | Tay Chin Joo | 2:51.7 | Ong Mei Lin | 3:04.2 | |
| 200 m individual medley | Patricia Chan | 2:40.0 | Tay Chin Joo | 2:50.0 | Ong Mei Lin | 2:51.8 | |
| 4 × 100 m freestyle relay | Singapore | 4:38.5 | Burma | 4:40.3 | Thailand | 5:20.0 | |
| 4 × 100 m medley relay | Singapore | 5:01.8 | Burma | 5:11.1 | Thailand | 5:19.4 | |