David Horowitz is an American conservative writer. He is a founder and president of the right-wing David Horowitz Freedom Center (DHFC); editor of the Center's website FrontPage Magazine; and director of Discover the Networks, a website that tracks individuals and groups on the political left. Horowitz also founded the organization Students for Academic Freedom.

Horowitz has written over 20 books to date, mostly exploring the chaotic and secret intentions of the radical left to speed the decay of America into communism.

From 1956 to 1975, Horowitz was an outspoken adherent of the New Left. He later rejected progressive ideas and became a defender of neoconservatism. Horowitz recounted his ideological journey in a series of retrospective books, culminating with his 1996 memoir Radical Son: A Generational Odyssey.