Sir William Emsley Carr (1 May 1867 – 5 August 1941) was a British newspaper editor, who edited the News of the World for more than fifty years.
His uncle, Henry Lascelles Carr, was a founder and editor of the Western Mail, based in Cardiff, and he saw promise in Emsley, and summoned him to work as a journalist on the newspaper.
In 1891, Lascelles Carr was part of a syndicate which purchased the News of the World, a London-based Sunday newspaper with a small circulation, and he decided to appoint his nephew as its new editor.
Carr also continued to write for the Western Mail, acting as its chief political correspondent until the 1930s, using his membership of the Parliamentary lobby to obtain stories.
Carr served as High Sheriff of Glamorgan in 1938, as Chairman of the Press Gallery at Parliament in 1930/1, and President of the Institute of Journalists in 1932/3.