Sir William de Tracy (died c. 1189) was a knight and the feudal baron of Bradninch, Devon, with caput at the manor of Bradninch near Exeter, and was lord of the manors (amongst very many others) of Toddington, Gloucestershire and of Moretonhampstead, Devon.[1] He is notorious as one of the four knights who assassinated Thomas Becket, Archbishop of Canterbury, in December 1170.