William Mullen (born October 9, 1944) is an American journalist, who was a reporter and correspondent for the Chicago Tribune, which he joined in 1967 and retired from in 2012.
In 1975, Mullen and Chicago Tribune photographer Ovie Carter were awarded the Pulitzer for International Reporting for a six-part series on world hunger and famine.
When the Tribune had the opportunity to place a reporter undercover in the Board of Election Commissioners, Mullen was selected because his face was not a familiar one in Chicago City Hall.
From 1978 to 1981, Mullen served as the chief correspondent of the Chicago Tribune London Bureau, traveling extensively in Europe, the Middle East and Asia.
In the 1990s, he turned to writing on and reporting on cultural affairs and the natural sciences, an assignment that twice took him to Antarctica and the South Pole and on extended trips to the Peruvian Amazon to save a pristine forest from oil drilling.