Piotr Siemionowski (born 6 June 1988 in Mrągowo) is a Polish sprint canoeist who has been competing since the late 2000s. He won a World Champion title in the K-1 200 m event at the 2011 ICF Canoe Sprint World Championships in Szeged, Hungary.
Siemionowski trains in the Zawisza Bydgoszcz.