The swimming events of the 1991 Mediterranean Games were held in Athens, Greece. It was a long course (50 metres) event.
| 50 m freestyle | 23.57 | 23.65 | 23.80 | ||||
| 100 m freestyle | 51.39 | 52.00 | 52.45 | ||||
| 200 m freestyle | 1:49.34 | 1:50.79 | 1:51.95 | ||||
| 400 m freestyle | 3:59.29 | 3:59.58 | 3:59.67 | ||||
| 1500 m freestyle | 15:43.46 | 15:48.20 | 15:52.37 | ||||
| 100 m backstroke | 57.22 | 57.76 | 58.07 | ||||
| 200 m backstroke | 2:02.11 | 2:02.33 | 2:03.27 | ||||
| 100 m breaststroke | 1:03.82 | 1:04.08 | 1:04.94 | ||||
| 200 m breaststroke | 2:15.39 | 2:16.49 | 2:17.01 | ||||
| 100 m butterfly | 54.96 | 55.15 | 55.38 | ||||
| 200 m butterfly | 2:01.44 | 2:01.49 | 2:03.22 | ||||
| 200 m individual medley | 2:06.29 | 2:07.50 | 2:07.94 | ||||
| 400 m individual medley | 4:23.37 | 4:28.77 | 4:29.33 | ||||
| 4x100 m freestyle | 3:25.62 | 3:26.33 | 3:28.08 | ||||
| 4x200 m freestyle | 7:28.71 | 7:30.85 | 7:38.63 | ||||
| 4x100 m medley | 3:46.03 | 3:48.03 | 3:53.41 |
| 50 m freestyle | 26.96 | 27.09 | 27.12 | ||||
| 100 m freestyle | 58.05 | 58.18 | 58.19 | ||||
| 200 m freestyle | 2:04.51 | 2:05.03 | 2:05.37 | ||||
| 400 m freestyle | 4:15.10 | 4:24.12 | 4:25.21 | ||||
| 800 m freestyle | 8:37.09 | 8:42.42 | 9:01.84 | ||||
| 100 m backstroke | 1:05.16 | 1:05.61 | 1:05.68 | ||||
| 200 m backstroke | 2:14.81 | 2:17.54 | 2:18.34 | ||||
| 100 m breaststroke | 1:12.00 | 1:13.55 | 1:14.21 | ||||
| 200 m breaststroke | 2:33.12 | 2:35.19 | 2:36.67 | ||||
| 100 m butterfly | 1:02.53 | 1:03.42 | 1:04.10 | ||||
| 200 m butterfly | 2:15.63 | 2:15.93 | 2:16.71 | ||||
| 200 m individual medley | 2:19.35 | 2:21.15 | 2:21.49 | ||||
| 400 m individual medley | 4:52.59 | 4:55.40 | 4:55.48 | ||||
| 4x100 m freestyle relay | 3:52.56 | 3:54.05 | 3:58.05 | ||||
| 4x100 m medley relay | 4:18.81 | 4:20.49 | 4:23.05 |