Medal table
| 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 | |
| 1991 FINA World Championships | ||
|---|---|---|
| Diving | ||
| Individual | ||
| 1 m | men | women |
| 3 m | men | women |
| 10 m | men | women |
| Open water swimming | ||
| 25 km | men | women |
| Swimming | ||
| Freestyle | ||
| 50 m | men | women |
| 100 m | men | women |
| 200 m | men | women |
| 400 m | men | women |
| 800 m | men | women |
| 1500 m | men | women |
| Backstroke | ||
| 100 m | men | women |
| 200 m | men | women |
| Breaststroke | ||
| 100 m | men | women |
| 200 m | men | women |
| Butterfly | ||
| 100 m | men | women |
| 200 m | men | women |
| Individual medley | ||
| 200 m | men | women |
| 400 m | men | women |
| Freestyle relay | ||
| 4×100 m | men | women |
| 4×200 m | men | women |
| Medley relay | ||
| 4×100 m | men | women |
| Synchronised swimming | ||
| Solo | women | |
| Duet | women | |
| Team | women | |
| Water polo | ||
| Tournament | men | women |
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.
| 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 | |
| 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 |
| 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 |