William Legge may refer to:
- William Legge (MP) (1608–1670), British Member of Parliament for Southampton, 1661–1670
- William Legge, 1st Earl of Dartmouth (1672–1750), Lord Privy Seal
- William Legge, 2nd Earl of Dartmouth (1731–1801), British statesman, Secretary of State for the Colonies 1772–1775
- William Legge, 4th Earl of Dartmouth (1784–1853), Fellow of the Royal Society
- William Legge, 5th Earl of Dartmouth (1823–1891), Conservative politician
- William Legge, 6th Earl of Dartmouth (1851–1936), Conservative politician
- William Legge, 7th Earl of Dartmouth (1881–1958), Conservative politician
- William Legge, 10th Earl of Dartmouth (born 1949), British peer and politician
- William Vincent Legge (1841–1918), Australian ornithologist
- William Legge (bishop) (1913–1999), Canadian Anglican priest
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