William Thomson
William Thomson may refer to:
- William Thomson (military officer), American militia captain
- William Thomson, 1st Baron Kelvin (1824–1907), UK physicist now usually known as Lord Kelvin
- William Thomson (bishop) (1819–1890), Archbishop of York 1862–1890
- William Thomson (musicologist) (fl. 1695–1753), Scottish folk song collector and singer
- William Alexander Thomson, Canadian author and politician
- Sir William Thomson (Solicitor General), Solicitor General for England and Wales 1717–1720
- William Ennis Thomson (b. 1924), music school dean – USC, music theorist, music educator, composer
- William McKenzie Thomson, Canadian World War I pilot
- W. H. Seward Thomson (1856-1932), U.S. federal judge
- William Mitchell-Thomson, 1st Baron Selsdon, British politician
- See also