Peter Alexander Beinart is an American liberal columnist, journalist, and political commentator. A former editor of The New Republic, he has also written for Time, The New York Times, and The New York Review of Books among other periodicals. He is also the author of three books.

The New Republic is a liberal American publisher focused on domestic politics, news, culture, and the arts, with ten magazines a year and a daily online platform. Founded in 1914 by several leaders of the progressive movement, it attempted to find a balance between "a liberalism centered in humanitarian and moral passion and one based in an ethos of scientific analysis".