Open water swimming at the 1991 World Aquatics Championships
These are the results from the open water swimming competition at the 1991 World Aquatics Championships, which took place in Perth, Australia.
Medals table
| 1 |  United States |
1 | 1 | 1 | 3 |
| 2 |  Australia |
1 | 0 | 1 | 2 |
| 3 |  Italy |
0 | 1 | 0 | 1 |
Medal summary
Men
| Event | Gold | Silver | Bronze |
| 25 km |
 Chad Hundeby (USA)5:01:45.78 |
Sergio Chariandini (ITA) 5:03:18.81 |
David O'Brien (AUS) 5:08:53.35 |
Women
| Event | Gold | Silver | Bronze |
| 25 km |
Shelley Taylor-Smith (AUS) 5:21:05.53 |
Martha Jahn (USA) 5:25:16.67 |
Karen Burton (USA) 5:28:22.74 |