Henry Addington Bayley Bruce (1874–1959) was an American journalist and author, born in Toronto, Ontario, Canada, and educated at Upper Canada College and Trinity College, Toronto. He was for a time on the Toronto Week, then came to the United States, was employed by the American Press Association between 1897 and 1903, and afterward contributed to many periodicals, notably The Outlook. In 1916 he resigned as staff contributor to The Outlook. In 1915 he became psychological adviser to the Associated Newspapers. Addington Bruce also wrote books. His most successful work was in American history and in popularizing modern psychology and psychical research.