Sir Frederick Tilney (died 1445) Lord of Ashwellthorpe, Norfolk, and Boston, Lincolnshire, England, was the husband of Elizabeth Cheney, Lady Say and father of Elizabeth Tilney, Countess of Surrey.

[1] He is notably the great-grandfather of Anne Boleyn and Catherine Howard, two of the wives of King Henry VIII of England, and also the great-great-grandfather to Queen Elizabeth I, the daughter of Henry VIII and Anne Boleyn.

He made his principal residence at Ashwellthorpe Manor, inheriting his father's titles which were originally earned during the Siege of Acre amidst the Third Crusade.

[4] They only had one daughter: Frederick died from unknown causes on c. 1445 and was buried at All Saints Churchyard, in Newsham Abbey.

[5] His widowed wife Elizabeth Cheney went on to marry again one year later to Sir John Say of Broxbourne, Speaker of the House of Commons, and a member of the household of King Henry VI.