Szymon Wojciech Sajnok (born 24 August 1997) is a Polish road and track cyclist, who last rode for UCI ProTeam Q36.5 Pro Cycling Team.

[4] As a junior, he participated at the 2014 UCI Road World Championships in the Men's junior time trial and at the 2015 UCI Road World Championships also in the Men's junior time trial.

On the track he competed at the 2016 UEC European Track Championships in the elimination race event and team pursuit event.

[5] In August 2019, he was named in the startlist for the 2019 Vuelta a España.

[6] In September 2020, Sajnok signed a two-year contract with the Cofidis team, from the 2021 season.