Other
- Pepper LaBeija (1948–2003), head of the House of LaBeija in New York's ball culture of the 1980s
- William Jackson (bishop) (1751–1815), bishop of Oxford
- William Jackson (Scottish composer) (born 1955), Scottish composer
- William Henry Jackson (1843–1942), early photographer of the American West
- William Jackson (gangster) (1901–1961), loan shark, enforcer and murder victim
- William K. Jackson, architect and co-founder of KBJ Architects
- William Jackson (engineer) (1848–1910), Boston, Massachusetts city engineer, 1885–1910
- William Jackson (organist born 1730) (1730–1803), referred to as Jackson of Exeter, English organist and composer
- William Jackson (organist born 1815) (1815–1866), English organist and composer
- William Jackson (priest) (1838–1931), Rector of Exeter College, Oxford
- William Jackson (Canadian administrator), Canadian administrator
- William Walrond Jackson (1810–1895), Bishop of Antigua, 1860–1879
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