Morley was the son of John Morley, MP. He matriculated at Christ Church, Oxford on 18 June 1602, aged 16 and was a student of Inner Temple in 1604. In 1625 he was elected Member of Parliament for Guildford. He was knighted at Titchfield on 4 September 1625. He was re-elected MP for Guildford in 1626.
He was appointed High Sheriff of Surrey and Sussex for Jan-Nov, 1636. In November 1640, Morley was elected MP for Chichester in the Long Parliament. On the outbreak of the Civil War, he put a garrison into Chichester, and was thereupon disabled from sitting in Parliament on 23 November 1642. Morley lived at Halnaker. He married Mary Heath, daughter of Sir Robert Heath. On his death, reportedly from cutting his throat, he was buried at Boxgrove.
- 'Alumni Oxonienses, 1500-1714: Mordaunt-Mytton', Alumni Oxonienses 1500-1714 (1891), pp. 1026-1049.Date accessed: 8 May 2012
- Knights of England
- 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.
- The House of Commons: 1690-1715 By Eveline Cruickshanks, Stuart Handley
- "MORLEY, Sir William (1606-1658), of Halnaker, Boxgrove, Suss". History of Parliament Online. Retrieved 6 June 2013.
|Parliament of England|
| Member of Parliament for Guildford
With: Robert Parkhurst
| Member of Parliament for Chichester
With: Christopher Lewknor
Sir John Temple