Joseph Patrick Lockhart is a spokesman and communications consultant, best known for being the 21st White House Press Secretary from October 5, 1998 to September 29, 2000, during the administration of U.S. President Bill Clinton. Previously, he had worked as press secretary for several Democratic politicians, including Walter Mondale, Paul Simon, and Michael Dukakis. Following his work as press secretary in the Clinton administration, he was an advisor to John Kerry during his 2004 presidential campaign. He subsequently founded and became managing director of the communications consulting firm The Glover Park Group, worked for Facebook from 2011 to 2012, and was executive vice president of communications and public affairs for the NFL from 2016 to 2018.

The White House press secretary is a senior White House official whose primary responsibility is to act as spokesperson for the executive branch of the United States federal government, especially with regard to the president, senior aides and executives, as well as government policies.