| Hong Seong-hui | |
| Birth Date: | 9 July 1969 |
| Height: | 163 cm (at the 1988 Olympics) |
| Weight: | 48 kg (at the 1988 Olympics) |
| Discipline: | Rhythmic gymnastics |
| Level: | Senior international |
| Show-Medals: | yes |
Hong Seong-hui (Korean: 홍 성희, July 9, 1969) is a South Korean rhythmic gymnast.
Hong Seong-hui competed for South Korea in the rhythmic gymnastics individual all-around competition at the 1988 Summer Olympics in Seoul. There she was 29th in the preliminary (qualification) round and did not advance to the final.[1]