William Peryn (died 1558) was an English [[Catholic Church|Catholic]] theologian and prior of St Bartholomew's, [[Smithfield, London]].
Peryn was educated at [[Blackfriars, Oxford|]] in [[Oxford]] and there are records of him being there in 1529 and 1531, the year in which he was ordained.ref He went to London and was a preacher strongly against heresy, and a chaplain to [[John Port (died 1557)|Sir John Port]]. He went into exile with the [[...|declaration of royal supremacy]] in 1534 but returned to England in 1543, when he applied for a degree of BTh at Oxford. He became a chantrist at and in early 1547 preached in favour of images in religious services.ref
With the accession of Protestant [[Edward VI of England|Edward VI]] in 1547 he went into exile again, spending several years in [[Leuven|Louvain]] before returning to England in 1553 upon the accession of Catholic [[Mary I of England|Mary I]]. That year he was appointed prior of the [[Dominican Order|Dominican]] house at [[St Bartholomew-the-Great|St Bartholomew's]] in [[Smithfield, London]]. This was the first religious house founded by Mary. On 8 February 1556 Peryn is recorded by the diarist [[Henry Machyn]] as preaching at [[Paul's Cross]].ref