Thomas Haydock (1772–1859) was an English Catholic schoolmaster and publisher born to one of the oldest Recusant families. His dedication to making religious books available to fellow Catholics suffering under the English Penal Laws came at great personal cost.
He is best remembered for publishing an edition of the Douay Bible with extended commentary, compiled chiefly by his brother George Leo Haydock. Originally published in 1811 and still in print, it is one of the most enduring contributions to Catholic biblical studies.