William Manning
William Manning may refer to:
- William Manning, an American investment firm founder for whom the Manning rule is named
- William Manning , New England farmer, foot soldier and author of The Key of Libberty
- William Manning , English ejected minister and Unitarian writer
- William Manning , British merchant and politician
- William Montagu Manning, Australian politician
- William Patrick Manning, Australian politician
- Sir William Manning , British soldier and colonial administrator
- William T. Manning, American Episcopal bishop
- William Manning , Anglican bishop in Africa
- William Oke Manning, British aerospace engineer
- William Manning , member of the Legislative Assembly of Western Australia
- Bill Manning, American sports executive, currently the President of Toronto FC and the Toronto Argonauts