Others
- William Harris (beachcomber) (c. 1813–1889), British escaped convict and settler in pre-colonial Nauru
- William Harris (theatrical producer) (1844–1916), American theatre producer and vaudevillian performer
- William Harris (Tudor person) (1556–1616), English knight, landowner and incorporator in the third Virginia Company of London
- William Harris (settler) (1610–1681), founding settler of Providence, Rhode Island
- William Harris, 6th Earl of Malmesbury (1907–2000), British peer
- W. A. Harris (born 1950), Canadian-born neuroscientist
- William Charles Harris, London Metropolitan police executive
- William Critchlow Harris (1854–1913), Canadian architect
- Sir William Henry Harris (1883–1973), English organist and composer
- William Laurel Harris (1870–1924), American muralist and editor
- William Torrey Harris (1835–1909), American educator, philosopher, and lexicographer
- William Harris, founder of the Ottawa Citizen newspaper
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