Faithorne was born in London and was apprenticed to William Peake. On the outbreak of the Civil War Faithorne accompanied his master into the king's service, and being made prisoner at Basing House, he was confined for some time to Aldersgate, where, however, he was permitted to follow his profession of engraver, and among other portraits did a small one of George Villiers, 1st Duke of Buckingham.
At the earnest solicitation of his friends Faithorne very soon regained his liberty, but only on condition of retiring to France, where he received instruction from Robert Nanteuil. He was permitted to return to England in about 1650, and took a shop near Temple Bar, where, besides his work as an engraver, he carried on a large business as a print-seller.
In 1680 Faithorne gave up his shop and retired to a house in Blackfriars, occupying himself chiefly in painting portraits from the life in crayons, although still occasionally engaged in engraving. It is said that his life was shortened by the misfortunes, dissipation, and early death of his son William. He was buried in the church of St Ann Blackfriars on 13 May 1691.
Faithorne is especially noted as a portrait engraver, his subjects including Sir Henry Spelman, Oliver Cromwell, Henry Somerset, Marquis of Worcester, John Milton, Queen Catherine, Prince Rupert of the Rhine, Cardinal Richelieu, Sir Thomas Fairfax, Thomas Hobbes, Richard Hooker, Robert Devereux, 2nd Earl of Essex, and Charles I. The 1911 edition of the Encyclopædia Britannica describes Faithorne's engravings as "remarkable for their combination of freedom and strength with softness and delicacy", adding that "his crayon paintings unite to these the additional quality of clear and brilliant colouring".
In 1658 Faithorne engraved a large map of London which had been drawn by the Somerset landowner Richard Newcourt. Printed on four sheets, it provides important evidence for the geography of the City before the Great Fire. In 1662 he issued a translation of Abraham Bosse’s treatise, under the title of The art of graveing and etching, wherein is exprest the true way of graveing in copper. Also the manner and method of ... Callot and Mr. Bosse in their severall ways of etching".
- "Anthony Griffiths". Oxford Dictionary of National Biography (online ed.). Oxford University Press. 2004. doi:10.1093/ref:odnb/60973.(Subscription or UK public library membership required.)
- Encyclopædia Britannica, 1911
- Strutt 1786, p.283
- Cust, Lionel Henry (1894). "Newcourt, Richard (d.1679)". In Lee, Sidney (ed.). Dictionary of National Biography. 40. London: Smith, Elder & Co.
- Waller, I.G. (1858). "Maps of London, Seventeenth Century. Faithorne". The Gentleman's Magazine, and Historical Chronicle. 205: 373 et seq.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Faithorne, William". Encyclopædia Britannica (11th ed.). Cambridge University Press.
- Strutt, Joseph (1786). A Biographical Dictionary Containing All the Engravers, From the Earliest Period of the Art of Engraving to the Present Day. 2. London: Robert Faulder.