HuffPost, formerly The Huffington Post until 2017 and sometimes abbreviated HuffPo, is an American news aggregator and blog, with localized and international editions. The site offers news, satire, blogs and original content, and covers politics, business, entertainment, environment, technology, popular media, lifestyle, culture, comedy, healthy living, women's interests and local news featuring columnists. It has been described as liberal-leaning. The site offers content posted directly on the site as well as user-generated content via video blogging, audio, and photo. In 2012, the website became the first commercially run United States digital media enterprise to win a Pulitzer Prize.

Founded by Andrew Breitbart, Arianna Huffington, Kenneth Lerer, and Jonah Peretti, the site was launched on May 9, 2005, as counterpart to the conservative news site Drudge Report. In March 2011, it was acquired by AOL for US$315 million, making Arianna Huffington editor-in-chief. In June 2015, Verizon Communications acquired AOL for US$4.4 billion and the site became a part of Verizon Media. In November 2020, BuzzFeed acquired the company. Several months after the acquisition, BuzzFeed laid off 47 HuffPost staff in the U.S. (mostly journalists) and closed down HuffPost Canada, laying off 23 staff working for the Canadian and Quebec divisions of the company.