| Ilona Biacsi | |
| Nationality: | Hungarian |
| Birth Date: | 29 December 1985 |
| Birth Place: | Szeged, Hungary |
| Sport: | Track and field |
| Disability Class: | T20 |
| Event: | 800m 1500m 3000m |
| Club: | Szegedi VSE |
| Coach: | János Zemen |
Ilona Biacsi (born 29 December 1985) is a Hungarian Paralympic athlete competing mainly in category T20 middle-distance events.[1]
Biacsi competed at the 2012 Summer Paralympics in London, winning a bronze medal in the women's 1,500m race in her classification.[2] She also won the European Championship title in the 1,500 metres in 2014 in Swansea. Biacsi's twin sister, Bernadett is also a T20 middle-distance athlete and the two were chosen to be joint flag bearers for Hungary at the opening ceremony of the 2012 Summer Paralympics.[3]