Ondrej Tunka (born 29 September 1990) is a Czech slalom canoeist who has competed at the international level since 2008.
He won four medals at the ICF Canoe Slalom World Championships with three golds (K1: 2017, K1 team: 2015, 2017) and a bronze (K1 team: 2018).
He also won two gold medals in the K1 team event at the European Championships.