William Baillie
William Baillie may refer to:
- William Baillie of Lamington, Scottish landowner
- William Baillie, Lord Provand, Scottish judge
- William Baillie (soldier), Scottish professional soldier
- William Baillie (engraver), Irish artist
- William Baillie, Lord Polkemmet, Scottish judge
- William Baillie (East India Company officer), British lieutenant-colonel
- William Baillie (18th century artist), British artist, active in Calcutta
- Sir William Baillie, 2nd Baronet, Scottish MP for Linlithgowshire
- W. D. H. Baillie, New Zealand politician
- William Baillie (cricketer), English cricketer
- William J. L. Baillie, Scottish artist
- Bill Baillie, New Zealand runner