Mariusz Łukasz Wlazły (born 4 August 1983) is a Polish volleyball player, member of the Poland men's national volleyball team in 2005–2014, participant of the Olympic Games (Beijing 2008), 2014 World Champion, silver medallist of the 2006 World Championship, nine–time Polish Champion (2005, 2006, 2007, 2008, 2009, 2010, 2011, 2014, 2018). On club level, he plays for Polish team Trefl Gdańsk.