Mariusz Lukasz Wlazly (born 4 August 1983) is a Polish volleyball player, a member of Poland men's national volleyball team and Polish club PGE Skra Belchatów, a participant of the 2008 Olympic Games, 2014 World Champion, a silver medalist of the 2006 World Championship, nine-time Polish Champion (2005, 2006, 2007, 2008, 2009, 2010, 2011, 2014, 2018).
Wlazly won the best athlete in the World award in 2014 according to SportAccord.