Mateusz Polaczyk (born 22 January 1988) is a Polish slalom canoeist who has competed at the international level since 2004.
He won six medals at the ICF Canoe Slalom World Championships with four silvers (K1: 2011, 2015; K1 team: 2013, 2018) and two bronzes (K1: 2013, K1 team: 2006).
He also won three golds, two silvers and two bronzes at the European Championships.Polaczyk finished 4th in the K1 event at the 2012 Summer Olympics in London.He has four brothers (Grzegorz, Rafal, Henryk and Lukasz) and two sisters (Joanna Medon and Iwona) all of whom have competed in canoe slalom.