Frederick (April 19, 1452 – November 9, 1504), sometimes called Frederick IV or Frederick of Aragon, is the last King of Naples of the Neapolitan branch of the House of Trastámara, ruling from 1496 to 1501.

He is the second son of Ferdinand I, younger brother of Alfonso II, and uncle of Ferdinand II, his predecessor.

A combination of King Louis XII of France and Frederick's famous cousin King Ferdinand II of Aragon have continued the claim of Louis's predecessor, King Charles VIII of France, to Naples and Sicily.

In 1501 they depose Frederick; Naples initially goes to Louis, but by 1504 a falling-out leads to Naples' seizure by Ferdinand, after which it will remain part of the Spanish possessions until the end of the War of the Spanish Succession.