Tadeusz Błażusiak, also known as Taddy Blazusiak (born 26 April 1983 in Nowy Targ, Poland) is a Polish motorcycle rider who has won professional titles in trial, enduro and endurocross.

The rider dominated the 2009-2010 season, claiming the title with ten wins and second-place finishes in the remaining two races.

In 2012-2013 he won four times and ended in the podium in all races, collecting his fourth straight title.

He won the FIM SuperEnduro World Championship again in 2013-14 and 2014–15, completing six consecutive titles.

Błażusiak won the Las Vegas round of the 2007 AMA EnduroCross Championship.