| Kseniya Sydorenko | |
| Nationality: | Ukrainian |
| Strokes: | Synchronized swimming |
| Club: | Panellinios GS |
| Birth Date: | 2 July 1986 |
| Birth Place: | Kharkiv, Ukrainian SSR, Soviet Union |
| Height: | 1.78 m |
| Weight: | 60 kg |
| Show-Medals: | no |
Kseniya Volodymyrivna Sydorenko (Ukrainian: Ксенія Володимирівна Сидоренко; born 2 July 1986) is a Ukrainian synchronized swimmer.
She competed in the women's duet at the 2008 and 2012 Summer Olympics as well as in the women's team at the 2016 Summer Olympics. She is twice 2017 World Aquatics Championships medalist, twice European champion and multiple European Championships medalist.