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.
| Open water swimming at the 1991 World Aquatics Championships | |
|---|---|
| Host city | Perth, Australia |
| Events | 2 |
1994 → | |
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
editMen
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 |