Thomas Tropenell, sometimes Tropenelle and Tropnell (c. 1405 – 1488), was an English lawyer and landowner in Wiltshire in the west of England.
He acquired large estates, built Great Chalfield Manor, and compiled the Tropenell Cartulary.
Tropenell, later of Great Chalfield, Neston, and Salisbury, was born about 1405, the son of Henry Tropenell and his wife, Edith, who was the daughter of Walter Roche.
Augustus Pugin, in a chapter on Great Chalfield in his Examples of Gothic architecture, gives a pedigree of the Tropenell family stated to be taken from "a MS now in the possession of William Waldron, Esq." According to this, "long before the time that no mind renueth, and before the conquest" a Wiltshire knight named Sir Osbert Tropenell was lord of the whole lordship of Sapworth. Of his two sons, James and Walter, the second son, Walter, received lands in Sherston, Ivy Church, Whaddon and Combe, and married Catherine, the daughter of Sir William Percy, sister of Sir Harry Percy, lords of "Much Chaldefeld, otherwise called East Chaldefeld", having a son, Philip, and a daughter, Galiana. Philip married Isawde, daughter of Richard Cotell, of "Cotells Atteward, otherwise Little Atteward", and left two sons, Roger and John, dividing his land between them. Roger married Christian, daughter of Sir John Rous, lord of Immer, and their son John Tropenell married Agnes, daughter of James Lye, lord of Liniford. Their son Harry Tropenell, who married Edith, the daughter of Walter Roche, younger brother of Sir John Roche, of Bromham, was the father of Thomas Tropenell.