| Event: | Swimming |
| Games: | 1970 Asian Games |
| Venue: | Visutdrarom Swimming Pool |
| Dates: | 12–16 December 1970 |
| Prev: | 1966 |
| Next: | 1974 |
Swimming was contested at the 1970 Asian Games in National Stadium, Bangkok, Thailand from December 12 to December 16, 1970.
| 100 m freestyle | 55.3 | 56.1 | 56.4 | ||||
| 200 m freestyle | 2:01.5 | 2:01.9 | 2:03.3 | ||||
| 400 m freestyle | 4:20.2 | 4:21.2 | 4:26.3 | ||||
| 1500 m freestyle | 17:25.7 | 17:42.7 | 17:45.9 | ||||
| 100 m backstroke | 1:01.2 | 1:02.4 | 1:03.7 | ||||
| 200 m backstroke | 2:13.2 | 2:17.6 | 2:18.6 | ||||
| 100 m breaststroke | 1:06.3 | 1:09.9 | 1:10.8 | ||||
| 200 m breaststroke | 2:28.2 | 2:34.0 | 2:35.5 | ||||
| 100 m butterfly | 58.7 | 58.8 | 1:01.2 | ||||
| 200 m butterfly | 2:09.0 | 2:16.0 | 2:16.3 | ||||
| 400 m individual medley | 4:57.8 | 5:02.8 | 5:05.8 | ||||
| 4 × 100 m freestyle relay | 3:41.9 | 3:52.0 | 3:52.1 | ||||
| 4 × 200 m freestyle relay | 8:14.9 | 8:35.8 | 8:35.8 | ||||
| 4 × 100 m medley relay | 4:00.4 | 4:15.3 | 4:18.1 |
| 100 m freestyle | 1:01.0 | 1:01.5 | 1:03.4 | ||||
| 200 m freestyle | 2:13.8 | 2:17.3 | 2:19.0 | ||||
| 400 m freestyle | 4:51.8 | 4:52.4 | 5:03.7 | ||||
| 100 m backstroke | 1:08.4 | 1:08.6 | 1:11.1 | ||||
| 100 m breaststroke | 1:18.9 | 1:19.8 | 1:20.6 | ||||
| 200 m breaststroke | 2:46.5 | 2:51.5 | 2:54.3 | ||||
| 100 m butterfly | 1:05.9 | 1:08.4 | 1:08.9 | ||||
| 200 m individual medley | 2:26.5 | 2:30.5 | 2:35.9 | ||||
| 4 × 100 m freestyle relay | 4:12.5 | 4:20.4 | Shen Bao-ni Wang Dai-yu Hsu Yue-yun Shen Pei-ni | 4:35.7 | |||
| 4 × 100 m medley relay | 4:35.4 | 4:55.8 | 5:08.5 |