Medal table
| Rank | Nation | Gold | Silver | Bronze | Total |
|---|---|---|---|---|---|
| 1 |  Canada (CAN) | 2 | 0 | 1 | 3 |
| 2 |  United States (USA) | 1 | 1 | 1 | 3 |
| 3 |  Japan (JPN) | 0 | 2 | 1 | 3 |
| Totals (3 entries) | 3 | 3 | 3 | 9 | |
These are the results from the synchronised swimming competition at the 1978 World Aquatics Championships.
| 1978 FINA World Championships | ||
|---|---|---|
| Diving | ||
| Individual | ||
| 3 m | men | women |
| 10 m | men | women |
| Swimming | ||
| Freestyle | ||
| 100 m | men | women |
| 200 m | men | women |
| 400 m | men | women |
| 800 m | women | |
| 1500 m | men | |
| 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 | |
| Medley relay | ||
| 4×100 m | men | women |
| Synchronised swimming | ||
| Solo | women | |
| Duet | women | |
| Team | women | |
| Water polo | ||
| Tournament | men | |
| Rank | Nation | Gold | Silver | Bronze | Total |
|---|---|---|---|---|---|
| 1 | Canada (CAN) | 2 | 0 | 1 | 3 |
| 2 | United States (USA) | 1 | 1 | 1 | 3 |
| 3 | Japan (JPN) | 0 | 2 | 1 | 3 |
| Totals (3 entries) | 3 | 3 | 3 | 9 | |
| Event | Gold | Silver | Bronze |
| Solo routine |
Helen Vanderburg (CAN) 187.849 |
Pam Tryon (USA) 181.499 |
Yasuko Unezaki (JPN) 179.650 |
| Duet routine |
Michelle Calkins (CAN) Helen Vanderburg (CAN) 183.300 |
Masako Fujiwara (JPN) Yasuko Fujiwara (JPN) 181.842 |
Michele Barone (USA) Pam Tryon (USA) 180.758 |
| Team routine |
United States (USA) 182.300 |
Japan (JPN) 181.533 |
Canada (CAN) 177.919 |