It (sometimes capitalized as IT), also more commonly known as Pennywise, the Dancing Clown, is the main antagonist of Stephen King's 1986 coming-of-age horror novel It, as well as its 1990 TV miniseries adaptation and the remastered 2017-2019 film duology of the same name. It is the archenemy of the Losers Club's very own Bill Denbrough.
He is portrayed by Bill Skarsgård.