William Baird may refer to:
- William R. Baird, birth control and abortion rights pioneer Bill_Baird_(activist)
- William Baird (politician) (1796–1864), Conservative MP for Falkirk Burghs
- William Alexander Baird (1867–1940), Ontario lawyer and politician
- William Teel Baird (1819–1897), New Brunswick historian
- William M. Baird (1862–1931), American Presbyterian missionary
- William L. Baird (1843–?), Massachusetts politician
- William Baird (physician) (1803–1872), Scottish physician and zoologist
- William Raimond Baird (1848–1917), publisher of Baird's Manual of American College Fraternities
- Various of the Baird baronets
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