William "Bill" Denbrough is a fictional character created by Stephen King and the main protagonist of his 1986 novel It. The character is considered to be the leader of "The Losers Club" and initiates finding and killing Pennywise the Dancing Clown after his younger brother Georgie is killed by the clown. The character was first portrayed in the 1990 TV mini-series by the late Jonathan Brandis as a child, and by Richard Thomas as an adult. In the 2017 adaptation and its 2019 sequel, the character was portrayed by Jaeden Martell as a child and James McAvoy as an adult.

It is a 1986 horror novel by American author Stephen King. It was his 22nd book and the 17th novel written under his own name. The story follows the experiences of seven children as they are terrorized by an evil entity that exploits the fears of its victims to disguise itself while hunting its prey. "It" primarily appears in the form of Pennywise the Dancing Clown to attract its preferred prey of young children.