For the character's Latin American counterpart, see Guillermo Clara.

Bill O'Reilly (portrayed by Mic Conway) is a guest character from Episode 17 of Series 2 of The Wiggles Show!. He is a friend of Anthony's, who lent O'Reilly his drum kit for personal use, subsequently lacking the kit for the Wiggles' music practice. After lending the kit to his own sister for a live concert, O'Reilly eventually returned the drum set to Anthony, but just as the band was about to start practicing, Murray reveals that he lent his guitar to O'Reilly, further preventing them from rehearsing.
A running gag in reference to his surname involves someone asking "Oh Really?" and another person responding "No, O'Reilly!".
He is also mentioned in bloopers from an unreleased Wigglehouse segment, in which he is referred to by Anthony as "the courier".