William Mackenzie may refer to:
- William Mackenzie (ophthalmologist) (1791–1868), Scottish ophthalmologist
- William Mackenzie (contractor) (1794–1851), British civil engineering contractor
- William Lyon Mackenzie (1795–1861), Scottish-born journalist & rebel in Upper Canada; grandfather of Canadian prime minister William Lyon Mackenzie King
- William Mackenzie (railway entrepreneur) (1849–1923), railway contractor and entrepreneur in Canada, the United States, and Brazil
- William Douglas Mackenzie (1859–1936), American theologian
- William Mackenzie (publisher) (fl. 1870), Scottish publisher and printer
- William McKenzie, Baron McKenzie of Luton (born 1946), English politician
- William Mackenzie, 1st Baron Amulree (1860–1942), British barrister, public servant and politician
- William Alexander McKenzie (1874–1966), builder and political figure in British Columbia
- William Colin Mackenzie (1877–1938), Australian anatomist, benefactor, museum administrator and director
- William Forbes Mackenzie (1807–1862), Scottish Conservative politician and temperance reformer
- William Mackay Mackenzie (1871–1952), Scottish historian, archaeologist and writer
- William Mackenzie, 5th Earl of Seaforth (died 1740), Scottish nobleman
- Will McKenzie (Inbetweeners), fictional character
- Will Mackenzie (born 1938), American television director and actor
- Will MacKenzie (born 1974), American golfer
- Billy Mackenzie (1957–1997), singer
- Billy MacKenzie (motorcyclist) (born 1984), Scottish motocross racer
- Bill MacKenzie (1911–1990), Canadian ice hockey player
- Bill McKenzie (born 1949), Canadian ice hockey player
Famous quotes containing the words william and/or mackenzie:
“I have been reporting club meetings for four years and I am tired of hearing reviews of the books I was brought up on. I am tired of amateur performances at occasions announced to be for purposes either of enjoyment or improvement. I am tired of suffering under the pretense of acquiring culture. I am tired of hearing the word “culture” used so wantonly. I am tired of essays that let no guilty author escape quotation.”
—Josephine Woodward, U.S. author. As quoted in Everyone Was Brave, ch. 3, by William L. O’Neill (1969)
“People sometimes tell me that they prefer barbarism to civilisation. I doubt if they have given it a long enough trial. Like the people of Alexandria, they are bored by civilisation; but all the evidence suggests that the boredom of barbarism is infinitely greater.”
—Kenneth MacKenzie Clark, Baron of Saltwood (1903–1983)