Alonso de Idiáquez y Yurramendi (Basque: Alfontso Idiakez; c. 1497 – 8 June 1547)[1] was a Spanish nobleman and politician.

[2] Idiáquez began his career working for Francisco de los Cobos, and became royal secretary to Charles I of Spain.

[1] Vives begins by telling “Señor Idiáquez” to always consider the rhetorical situation for the letter, primarily evaluating the relationship of the writer to the recipient.

He may have commissioned the illuminated manuscript known as the Munich-Montserrat Book of Hours, which was the work of the Flemish miniaturist Simon Bening.

[4] His grandson Alonso de Idiáquez Butrón y Múgica was the 1st Duke of Ciudad Real.