| Event: | Swimming |
| Games: | 1990 Asian Games |
| Venue: | Ying Tung Natatorium |
| Dates: | 23–28 September 1990 |
| Prev: | 1986 |
| Next: | 1994 |
Swimming was contested at the 1990 Asian Games in National Olympics Sports Center, Beijing, China from September 23 to September 28, 1990.
| 50 m freestyle | 22.99 | 23.33 | 23.42 | ||||
| 100 m freestyle | 50.64 | 51.02 | 51.79 | ||||
| 200 m freestyle | 1:51.90 | 1:52.48 | 1:52.56 | ||||
| 400 m freestyle | 3:56.32 | 3:58.85 | 4:00.00 | ||||
| 1500 m freestyle | 15:43.24 | 15:46.90 | 15:49.71 | ||||
| 100 m backstroke | 57.47 | 57.79 | 57.82 | ||||
| 200 m backstroke | 2:03.59 | 2:03.88 | 2:04.03 | ||||
| 100 m breaststroke | 1:02.60 | 1:03.12 | 1:03.25 | ||||
| 200 m breaststroke | 2:17.49 | 2:19.84 | 2:20.06 | ||||
| 100 m butterfly | 54.29 | 55.37 | 56.33 | ||||
| 200 m butterfly | 2:00.25 | 2:00.50 | 2:01.23 | ||||
| 200 m individual medley | 2:05.50 | 2:05.95 | 2:06.35 | ||||
| 400 m individual medley | 4:26.10 | 4:30.79 | 4:33.88 | ||||
| 4 × 100 m freestyle relay | 3:24.96 | 3:27.69 | 3:31.46 | ||||
| 4 × 200 m freestyle relay | 7:30.34 | 7:30.44 | 7:46.83 | ||||
| 4 × 100 m medley relay | 3:45.18 | 3:47.98 | 3:54.73 |
| 50 m freestyle | 25.86 | 26.32 | 26.45 | ||||
| 100 m freestyle | 55.30 | 56.10 | 57.06 | ||||
| 200 m freestyle | 2:01.43 | 2:02.27 | 2:02.36 | ||||
| 400 m freestyle | 4:13.55 | 4:14.25 | 4:20.93 | ||||
| 800 m freestyle | 8:40.27 | 8:42.01 | 8:54.55 | ||||
| 100 m backstroke | 1:03.83 | 1:03.85 | 1:04.45 | ||||
| 200 m backstroke | 2:13.81 | 2:16.66 | 2:16.88 | ||||
| 100 m breaststroke | 1:10.08 | 1:11.55 | 1:12.41 | ||||
| 200 m breaststroke | 2:30.79 | 2:31.02 | 2:31.86 | ||||
| 100 m butterfly | 58.87 | 58.89 | 1:01.73 | ||||
| 200 m butterfly | 2:09.62 | 2:10.40 | 2:13.98 | ||||
| 200 m individual medley | 2:13.16 | 2:19.66 | 2:22.06 | ||||
| 400 m individual medley | 4:39.88 | 4:46.97 | 4:50.63 | ||||
| 4 × 100 m freestyle relay | 3:46.39 | 3:56.81 | 3:59.54 | ||||
| 4 × 100 m medley relay | 4:11.74 | 4:15.66 | 4:25.50 |