These are the results from the open water swimming competition at the 1991 World Aquatics Championships, which took place in Perth, Western Australia. The US led the competition.
Medal table edit
| Rank | Nation | Gold | Silver | Bronze | Total |
|---|---|---|---|---|---|
| 1 |  United States (USA) | 1 | 1 | 1 | 3 |
| 2 |  Australia (AUS) | 1 | 0 | 1 | 2 |
| 3 |  Italy (ITA) | 0 | 1 | 0 | 1 |
| Totals (3 entries) | 2 | 2 | 2 | 6 | |
Medal summary edit
Men edit
| 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 edit
| 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 |