William Thomson
William, Billy or Bill Thomson may refer to:
Military
- William Thomson , American militia captain in Capture of Savannah
- William Taylour Thomson, British military officer and diplomat
- William Montgomerie Thomson, British general and commander of the British expeditionary force in north Persia
- William McKenzie Thomson, Canadian World War I pilot
Politics
- William Alexander Thomson, Canadian author and politician
- William Thomson , Member of Parliament in Christchurch, New Zealand
- William Mitchell-Thomson, 1st Baron Selsdon, British politician
Religion
- William Thomson , Scottish minister and historian
- William Aird Thomson, Scottish minister and antiquarian
- William McClure Thomson, American missionary and writer
- William Thomson , Archbishop of York, 1862–1890
- William Burns Thomson, Scottish medical missionary
Science
- William Thomson , English physician and geologist
- William Thomson , Scottish author and professor of medicine
- William Thomson, 1st Baron Kelvin, Scots-Irish mathematician, physicist and engineer.
- William Thomson , Irish surgeon
- William Johnston Thomson, Scottish engineer and businessman
Sports
- William Thomson , Scottish footballer
- William Thomson , Scottish footballer
- William Thomson , Scottish international rugby union player
- Bill Thomson , New Zealand cricketer and hockey player
- Billy Thomson, Scottish football wing half for Bristol Rovers and Leicester City
- Billy Thomson , Scottish goalkeeper for St Mirren, Dundee United, Motherwell, Dundee and Scotland
- Bill Thomson , Canadian ice hockey player
Other
- Edward William Thomson , Canadian writer
- William Thomson , British artist
- William Thomson , Scottish folk song collector and singer
- William John Thomson, American artist
- W. H. Seward Thomson, U.S. federal judge
- William Thomson , Scottish mathematician
- William Thomas Thomson , Scottish actuary
- William James Thomson, Canadian artist and engraver
- William Ennis Thomson, music school dean