FiveThirtyEight is an American political blog, written by Nate Silver and currently hosted by the New York Times, that analyzes polling data.

Originally, the site was launched anonymously in 2008 after Silver had been posting statistical poll analysis as an anonymous diarist at the liberal blog Daily Kos, beginning in late 2007. Silver revealed his identity in May 2008.

FiveThirtyEight grew quickly during the 2008 election runup, and Silver was acclaimed for remarkably accurate predictions of the 2008 presidential election results.

In August 2010, the New York Times’ began hosting Silver’s blog in an effort to “help New York Times readers cut through the clutter of this data-rich world.” It was rebranded as “FiveThirtyEight: Nate Silver’s Political Calculus”. The hosting was part of a three-year deal in which the Times licensed FiveThirtyEight’s content while also providing editorial guidance. Silver also contributes to the print edition of the Times as well as to the New York Times Magazine.