William Illingworth (1764 – 21 February 1845) was an English lawyer and archivist, who was an active editor of the publications of the Record Commission.
He made a general arrangement of the public records held in the chapter house of Westminster Abbey, and in 1808 drew up a press catalogue of their contents.
[1] Working as a record agent and translator, Illingworth entered Gray's Inn on 25 June 1825, but was not called to the bar.
[1] In the case of Roe v Brenton, Illingworth produced from the Lord Treasurer's Remembrancer's office an extent of the assessionable manors of the Duchy of Cornwall in the reign of Edward II; and in the case of The Mayor Burgesses and Commonalty of City of Bristol v Henry Bush he brought forward rolls of the reign of Henry VI, which established the rights of the Corporation of Bristol to all the tolls on shipping coming in and out of the port.
[1] Illingworth's Index cartarum de Scotia, in domo capitulari Westmonasterii was privately printed in folio by Sir Thomas Phillipps at Middle Hill about 1840.