Katsiaryna Semiantsova
- Country
- Individual Neutral Athletes
- National team
- Individual Neutral Athletes Canoe Sprint
- Born
- 2002
Katsiaryna Semiantsova is a Belarusian canoe sprint paddler (born 2002), competing as an Individual Neutral Athlete (AIN). She specialises in the C1 and C4 events over 500 m. At the 2025 ICF Junior and U23 Canoe Sprint World Championships in Montemor-o-Velho, Portugal, she won the U23 women's C4 500 m title and finished 7th in the U23 women's C1 500 m final.