Fernando de Toledo, (c.1528–1591) was a Spanish nobleman.
He was the illegitimate son and the 1st son of Don Fernando Álvarez de Toledo, 3rd Duke of Alba, "The Iron Duke", with the daughter a flour miller from La Aldehuela, province of Avila, Spain. He was 19 in 1546 when he was recognized as his own son by the really hard 3rd Duke. This was the subject of a theatre comedy written by great literary author, Félix Lope de Vega y Carpio, (1562–1635). The title, when translated into English loses the sound concordances between the words usual in poetry and reads the something like: "Más mal hay en La Aldegüela de lo que suena", approximately, "There are badder things in The Aldehuela than what it appears" .