William Mackenzie
William Mackenzie, McKenzie, Mckenzie or MacKenzie may refer to:
Artists, musicians, writers and entertainers
- William Lyon Mackenzie, Scottish-born journalist & rebel in Upper Canada; grandfather of Canadian prime minister William Lyon MacKenzie King
- * William Lyon Mackenzie (fireboat)
- William Mackay Mackenzie, Scottish historian, archaeologist and writer
- Will Mackenzie, American television director and actor
- Billy Mackenzie, Scottish singer
Politicians and noblemen
- Bill McKenzie, Baron McKenzie of Luton, English politician
- William Mackenzie, 1st Baron Amulree, British barrister, public servant and politician
- William Mackenzie, 5th Earl of Seaforth, Scottish nobleman
- William Albany McKenzie, mayor of Fremantle, Western Australia, and Administrator of Christmas Island
- William Alexander McKenzie, builder and political figure in British Columbia
- William Forbes Mackenzie, Scottish Conservative politician and temperance reformer
- William H. MacKenzie, New York assemblyman
- William McKenzie (Australian politician), Victorian state politician
Sportsmen
- Bill MacKenzie, Canadian ice hockey player
- Bill McKenzie (ice hockey), Canadian ice hockey player
- Bill McKenzie (footballer), Australian footballer for Melbourne
- Bill S. McKenzie, Australian footballer for Richmond
- Bill McKenzie (rugby league), New Zealand rugby league player
- Will MacKenzie, American golfer
- Billy MacKenzie (motorcyclist), Scottish motocross racer
- William McKenzie (rugby union), international New Zealand rugby union player
- William McKenzie (sailor), New Zealand sailor
Other people
- William Mackenzie (contractor), British civil engineering contractor
- William Mackenzie (ophthalmologist), Scottish ophthalmologist
- William Mackenzie (trader), born in Edinburgh, trader in Arorae, Gilbert Islands.
- William Mackenzie (railway entrepreneur), railway contractor and entrepreneur in Canada, the United States, and Brazil
- William Mackenzie (doctor), doctor in public health
- William Colin Mackenzie, Australian anatomist, benefactor, museum administrator and director
- William Douglas Mackenzie, American theologian
- William Gregor MacKenzie, plantsman and gardener
- William Macdonald Mackenzie, Scottish architect
- William MacKenzie (missionary), Australian missionary
- William McKenzie (missionary), Canadian missionary
- William Mackenzie (publisher), publisher of natural history books in the 1870s
- W. J. M. Mackenzie, British political scholar
- William John MacKenzie, American flying ace