William James Tatem, 1st Baron Glanely, known as Sir William Tatem, Bt, between 1916 and 1918, was a Welsh ship-owner and thoroughbred racehorse owner and breeder.
- Occupation
- businessperson, politician, ship-owner
- Position held
- member of the House of Lords
- Citizenship
- United Kingdom, United Kingdom of Great Britain and Ireland
- Born
- March 6, 1868
- Died
- June 28, 1942