William Ashburnham (Royalist)
William Ashburnham (ca. 1604–1679) was an English army officer and MP.
William Ashburnham was the younger brother of John Ashburnham.
He fought as an officer for the Royalist cause in the English Civil War and in 1644 was governor of Weymouth, a place he kept four months for King Charles. Ten years later, on 3 June 1654, he was arrested and examined on the charge of complicity in the plot to murder the Protector Oliver Cromwell for which Gerard and Vowel afterwards suffered. He does not, however, appear to have been sent before the high court of justice.
After the Restoration of the monarchy he was made cofferer of the royal household. He was frequently a fellow-guest and a sharer in treasury business with Pepys, who styles him an "experienced man and a cavalier". His "odd stories" are duly noted, and there was one touching the lease of Ashburnham House from the dean and chapter of Westminster, wherein the "devilish covetousness" of Dr. Busby was commemorated. He was returned again as MP for Ludgershall from 1661 until his death in 1679. 
- Henning, Basil Duke (1983). The House of Commons, 1660-1690 1. Boydell & Brewer. ISBN 0-436-19274-8.
- Knight, Charles, ed. (1866). Biography: or, Third division of "The English encyclopedia" 1. Bradbury, Evans & Co. p. 378.
- Cobbett, William; Wright, John; Hansard, Thomas Curson; Great Britain Parliament. & Scotland. Parliament (1807). The parliamentary history of England, from the earliest period to the year 1803: From which last-mentioned epoch it is continued downwards in the work entitled "Hansard's Parliamentary debates". Pr. by T.C. Hansard for Longman, Hurst, Rees, Orme & Brown. p. 623.
- This article incorporates text from a publication now in the public domain: Browne, Richard Charles (1885). "Ashburnham, William". In Stephen, Leslie. Dictionary of National Biography 2. London: Smith, Elder & Co. p. 164. The entry cites:
- The Tryal of Colonel Ashburnham, London (3 June), 1654, 4to;
- Pepys's Diary, ed. Bright, iv. 323.