William Baillie

William Baillie may refer to:
 * William Baillie of Lamington (died 1568), Scottish landowner
 * William Baillie, Lord Provand (died 1593), Scottish judge
 * William Baillie (soldier) (died 1653), Scottish professional soldier
 * William Baillie (engraver) (1723–1810), Irish artist
 * William Baillie, Lord Polkemmet (1736–1816), Scottish judge
 * William Baillie (East India Company officer) (died 1782), British lieutenant-colonel
 * William Baillie (artist) (1752/3–1799), British artist, active in Calcutta
 * Sir William Baillie, 2nd Baronet (1816–1890), Scottish MP for Linlithgowshire
 * W. D. H. Baillie (1827–1922), New Zealand politician
 * William Baillie (cricketer) (1838–1895), English cricketer
 * Bill Baillie (1934–2018), New Zealand runner