Others
- William Henderson (physician and homeopath) (1810–1872), Scottish medical and biblical scholar
- William Henderson (priest) (1819–1906), Anglican Dean of Carlisle
- William G. Henderson (1881–1922), co-founder, Henderson and Ace Motorcycle Companies
- William Henderson (landscape gardener) English landscape designer (1825–1866)
- William Henderson (philanthropist) (1826–1904), Scottish shipping merchant, builder of Royal Infirmary
- William Hannam Henderson (1845–1931), British vice-admiral founding editor of Naval Review
- William Penhallow Henderson (1877–1943), American painter, architect, and furniture designer
- William Williams Henderson (1879–1944), American Mormon educator
- William MacGregor Henderson (1913–2000), Scottish veterinary expert on foot and mouth disease
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