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.

He was runner-up at the 2007-2008 FIM Indoor Enduro World Cup with a best result of second in Germany.

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.

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