Frederic, Count of Luna (Spanish: Fadrique; c. 1401 – 29 May 1438), was a contender for the crown of Aragon.

Their illegitimate status notwithstanding, Frederic and his half-sister were the only grandchildren of the King and Queen of Aragon.

Martin the Elder was very fond of his grandson, but was nevertheless aware that his illegitimacy rendered his claim to the thrones of the Crown of Aragon significantly weaker, especially when compared to that of the closest legitimate agnate, Count James II of Urgell.

[3] He thus sought to have Frederic legitimated by the pope,[4] but died from laughter a year after Martin the Younger.

[7] Frederic resumed his claim to the throne in the 1430s, for which he was imprisoned and all his lands, including the County of Luna and the city of Segorb, were confiscated.