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