William Cheyne, 2nd Viscount Newhaven (14 July 1657 – 26 May 1728) was an English Tory politician and peer who sat in the House of Commons of England from 1681 until 1707 when as a viscount in the Peerage of Scotland he was required to sit in the House of Lords.
[2] In 1681, Cheyne was elected Member of Parliament for Amersham and sat until 1687.
He served as Lord Lieutenant of Buckinghamshire for six months in 1702 until opposed by the Whigs.
He was then elected MP for Amersham and sat until 1707 when under the Acts of Union 1707, having a Scottish peerage, he was required to sit in the House of Lords.
He nevertheless retained an interest in politics and in 1711 regained his position as Clerk of the Pipe for life and in 1712 was made Lord Lieutenant of Buckinghamshire for the second time, losing the lieutenancy on the succession of King George I in 1714.