| Korean name | |
| Headercolor: | lightgrey |
| Hangul: | 오성옥 |
| Rr: | O Seong-ok |
| Mr: | O Sŏng-ok |
Oh Seong-Ok (born October 10, 1972) is a former South Korean handball player. She is the first South Korean woman to compete at five Olympics (1992 to 2008).
At the 1992 Olympics, Oh was part of the South Korea team, which won the gold medal. She played all five matches and scored twenty goals. Four years later, she won the silver medal at the 1996 Olympics, a feat she repeated in 2004.