Others
- William Palmer (murderer) (1824–1856), doctor and multiple murderer
- William Palmer (theologian) (1803–1885), Anglican theologian and liturgical scholar
- William Palmer (ecumenist) (1811–1879), English theologian and antiquarian
- William Palmer, founder of Palmer's College in Thurrock
- William Palmer (novelist) (born 1943), professor of English and author
- William C. Palmer (1906–1987), American painter
- William Henry Palmer (1835–1926), American soldier
- William Isaac Palmer (1824–1893), English businessman
- William Jackson Palmer (1836–1909), American industrialist and general
- Bill Palmer (1917–1996), invented a 'quint' system which was later patented by Titano
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