Author:William Hamilton
- William Hamilton of Gilbertfield (1665?-1751), poet
- William Hamilton of Bangour (1704-1754), poet
- William Hamilton (1730-1803) — Scottish diplomat, antiquarian and vulcanologist
- William Hamilton (1783-1856) — Irish botanist
- William Hamilton (1788-1856) — Scottish philosopher
- Sir William Rowan Hamilton (1805–1865) — Irish physicist, astronomer, and mathematician
- William John Hamilton (1805–1867) — English geologist
- William Smith Hamilton (c. 1824–1903) — New Zealand educator and writer
- William Stewart Hamilton (fl.1879–1887) — New Zealand botanist