William Andleby (Anlaby) (executed at York, 4 July 1597) was an English Roman Catholic priest.
He visited Douay College out of curiosity and met William Allen; a discussion led to his conversion, and eventually Andleby became a Catholic priest, being ordained 23 March 1577, along with Ralph Sherwin.
"[2] Later Andleby acquired a horse, and around 1587 worked with another Douai priest and native of the Riding, William Atkinson.
He is known to have taken his ministry to Robert Tyrwhitt, in Lincolnshire, and also to the Catholic prisoners in Kingston upon Hull's blockhouse.
He was executed at York with three laymen: Henry Abbot, Thomas Warcop, and Edward Fulthrop.