Guillermo Prieto Pradillo audioⓘ (10 February 1818 – 2 March 1897) was a Mexican novelist, short-story writer, poet, chronicler, journalist, essayist, patriot and Liberal politician.

Together with Manuel Toussaint Ferrer and the brothers José María y Juan Lacunza, he founded the Academia de Letrán [es] in June 1836, with the aim of "the Mexicanization of literature".

Prieto began his career as a journalist and theater critic with El Siglo XX, publishing the column Los San Lunes de Fidel.

He worked for El Monitor Republicano, and together with Ignacio Ramírez he founded the satirical periodical Don Simplicio.

It was to the tune of "Los cangrejos" that the Liberals under General Jesús González Ortega reentered Mexico City in January 1861, ending the Reform War.

[2] A prolific author in many genres, with a festive and ironic style, Prieto's political passion is never far beneath the surface.