William Wyndham may refer to:
Sir William Wyndham, 1st Baronet (c. 1632–1683), of Orchard Wyndham, English politician, Member of Parliament for Somerset, 1656–1658 and for Taunton 1660–1679 Sir William Wyndham, 3rd Baronet (1687–1740), of Orchard Wyndham, English politician, Chancellor of the Exchequer, 1713–1714, Member of Parliament for Somerset, 1710–1740 The Hon. William Frederick Wyndham (1763–1828), English diplomat William Wyndham (1796–1862), English MP for Wiltshire South, 1852–1859
See also Wyndham baronets Earl of Egremont William Windham (disambiguation)