| Kateryna Tkachova | |
| Nationality: | Ukrainian |
| Strokes: | Synchronised swimming |
| Birth Date: | 21 October 1998 |
| Birth Place: | Kharkiv, Ukraine |
| Height: | 1.67 m |
| Weight: | 46 kg |
Kateryna Tkachova (Ukrainian: Катерина Ткачова; born 21 October 1998 in Kharkiv, Ukraine) is a Ukrainian synchronised swimmer. She won two bronze medals at the inaugural European Games where she was third in team and combination competitions.