Sir William Fairbairn (1789–1874) was a Scottish engineer.
William Fairbairn may also refer to:
William E. Fairbairn (1885–1960), British soldier and police officer William Fairbairn & Sons, an engineering works in Manchester, England Bill Fairbairn (born 1947), ice hockey player William Alexander Fairbairn (1902–1984), British forester and ornithologist William Ronald Dodds Fairbairn (1889–1964), member of the British Psychoanalytical Society
See also Fairbairn (disambiguation) William (disambiguation)