Maryia Vasilyeuna Katsiak (, ; born 2 March 1997) is a Belarusian female rhythmic gymnast. Katsiak won a silver medal as a member of the national squad at the 2016 European Championships in Holon, Israel, and eventually competed alongside her teammates Maria Kadobina, Hanna Dudzenkova, Valeriya Pischelina, and Arina Tsitsilina at the 2016 Summer Olympics in Rio de Janeiro, finishing outside of medals in the group all-around final with a fifth-place score of 35.299.