William Allestry or Allestrie (1588 – 4 September 1655) was an English politician who sat in the House of Commons of England from 1640 to 1643. He supported the Royalist side in the English Civil War.
In April 1640, Allestry was elected Member of Parliament for Derby for the Short Parliament. He was re-elected in November 1640 for the Long Parliament until he was disabled from sitting in October 1643.
Allestry married firstly on 9 April 1629 Sarah Smith, daughter of Thomas Smith. She died in 1638. He married again to Mary Agard, daughter of William Agard. He had three sons and four daughters by each of his wives.
- Venn's Alumni Cantabrigienses gives a birth date around 1598, suggests his father was a Thomas Allestry, and has him educated at St John's College, Cambridge before becoming a barrister from Gray's Inn. "Allestrie, William (ALSY618W)". A Cambridge Alumni Database. University of Cambridge.
- Willis, Browne (1750). Notitia Parliamentaria, Part II: A Series or Lists of the Representatives in the several Parliaments held from the Reformation 1541, to the Restoration 1660 ... London. pp. onepage&q&f=, false 229–239.
- Steven Glover The History of the County of Derby, Part 2
|Parliament of England|
Parliament suspended since 1629
| Member of Parliament for Derby
With: Nathaniel Hallowes