| Rieko Matsunaga | |
| Birth Date: | 19 May 1979 |
| Birth Place: | Tokyo, Japan |
| Height: | 171 cm (at the 2000 Olympics) |
| Weight: | 48 kg (at the 2000 Olympics) |
| Discipline: | Rhythmic gymnastics |
| Level: | Senior international |
| Show-Medals: | yes |
Rieko Matsunaga (Japanese: 松永 里絵子, born May 19, 1979, Tokyo) is a Japanese rhythmic gymnast.
Matsunaga competed for Japan in the rhythmic gymnastics individual all-around competition at the 2000 Summer Olympics in Sydney. There she was 16th in the qualification round and did not advance to the final of 10 competitors.[1]