William Legge may refer to:
William Legge (Royalist) (1608–1670), British Member of Parliament for Southampton, 1661–1670 William Legge (MP for Portsmouth) (c.1650–c.1697), son of the above, British Member of Parliament for Portsmouth, 1685 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 Kaye Legge (1869-1946), senior British Army officer during the First World War William Vincent Legge (1841–1918), Australian ornithologist William Legge (bishop) (1913–1999), Canadian Anglican priest
See also Wilfred Legg (born 1906), South African athlete Billy Legg (born 1948), English footballer