| Event: | Synchronized swimming |
| Games: | 2004 Summer |
| Venue: | Athens Olympic Aquatic Centre |
| Dates: | 23–27 August 2004 |
| Competitors: | 104 |
| Nations: | 24 |
| Prev: | 2000 |
| Next: | 2008 |
Synchronized swimming at the 2004 Summer Olympics was held in the Olympic Aquatic Centre where 104 competitors challenged for 2 gold medals in the duet and team events. Each event was made up of a technical and free routine with the points added together to determine the medalists.