David Joel Horowitz (born January 10, 1939) is an American conservative writer and policy advocate. Horowitz was a member of the New Left in the late 1960s before moving to the right in the 1970s.

He is a founder and the president of the David Horowitz Freedom Center, edits the conservative tabloid FrontPage Magazine, and writes for Christopher Ruddy's conservative website NewsMax. Horowitz founded the right-leaning activist group Students for Academic Freedom.