| Keiko Onidani | |
| Birth Date: | 21 December 1994[1] |
| Birth Place: | Kochi, Japan |
| Sport: | Para-athletics |
| Event: | discus throw |
| Disability Class: | F53 |
Keiko Onidani (born 21 December 1994) is a Japanese para-athlete specializing in discus throw. She represented Japan at the 2024 Summer Paralympics.
In May 2024, Onidani represented Japan at the 2024 World Para Athletics Championships and won a silver medal in the discus throw F53 event.[2] She then represented Japan at the 2024 Summer Paralympics and won a silver medal in the javelin throw F53 event.