William Nedham (c. 1740–1806) was an Irish and British politician who sat in the House of Commons between 1774 and 1790.
At the 1774 general election he stood at Wallingford where he was supported by Lord Abingdon, but had to withdraw after polling began.
He was returned for Winchelsea again in a by-election on 3 January 1775 after Arnold Nesbitt decided to sit for Cricklade instead.
In the 1780 general election Nedham was returned for Pontefract by his friend Robert Monckton-Arundell, 4th Viscount Galway.
[1] Nedham died unmarried at his home in Grosvenor Square on 27 April 1806, aged 65.