Sir John Shadworth, also Chadworth (died between 7 January 1430 and 6 October 1430) was an English politician, businessman, alderman and Sheriff of the City of London who served as Lord Mayor of London from 1401 to 1402.

[1] The first reference to Shadworth occurred in May 1371 where he is recognised as an executor of a man named Thomas Bushey.

Four years later, Shadworth (along with others), was accused by fishmonger Walter Sibille of conducting an armed raid upon his property in Great Yarmouth.

A royal commission was formed to investigate this; however, this seems to have had little consequence as in June 1382 Shadworth was on decent terms with Sibille as they could act as joint auditors of certain mercantile accounts.

He never married or had any children, and left most of his large estate for pious and charitable works.