Sir Harry Ernest Brittain, KBE, CMG (24 December 1873 — 9 July 1974) was a British journalist and Conservative politician.
Brittain was born at Ranmoor, Sheffield, and was the son of W. H. Brittain. Following education at Repton School, Rossall School and Worcester College, Oxford (where he achieved third class honours in jurisprudence), he entered training in business at Sheffield. In 1897 he was called to the Bar at the Inner Temple, but did not practice.
Instead he developed an interest in journalism. He became an assistant to Sir William Ingram, managing director of the Illustrated London News. He subsequently worked for Sir Arthur Pearson, founder of the Daily Express. Brittain worked on the staff of The Standard and Evening Standard, two of Pearson's papers.
Brittain tried to foster closer Anglo-American relations. To this end he founded the Pilgrims Society in 1902. For 17 years, first as honorary secretary and then as chairman, steered the Society through its early life. He resigned the chairmanship in 1918, because of his parliamentary duties, and became its senior vice-president, and the only Pilgrim Emeritus.
He was also a member of the original Committee of Sulgrave Manor Board, which was set up in 1914 to commemorate 100 years of peace between Great Britain and the United States. In addition to The Pilgrims, Brittain had many close associations with the United States. He was an honorary life member of the American Club, and the Society of Americans in London.