Richard Fiennes, 7th Baron Dacre jure uxoris (1415 – 25 November 1483) was an English politician and hereditary keeper of Herstmonceux Castle in Sussex.
He was the son of Sir Roger Fiennes, Member of Parliament (M.P.)
His paternal uncle was James Fiennes, 1st Baron Saye and Sele.
J. Horace Round held that the award of 1473 assigning the heir general and her husband precedence of the old barony, over that of the heir male, was a recognition of his wife's accession to the original barony.
Their children were: Another (unnamed) daughter was stated in the 1623 Heralds' Visitation of Gloucestershire to have been the first and short-lived wife of Sir Walter Denys (d. 1505) of Alveston, Glos., son/heir of Maurice Denys.