Juan Antonio Martínez was interim President of Guatemala from 16 August 1848 to 28 November 1848.

Martinez was elected due to the resignation of President José Rafael Carrera Turcios on August 15, 1848.

Being inexperienced in the realm of politics, the Martinez administration was a series of mistakes and deviations.

As an expert banker on foreign currency, he handled the Guatemalan bank well.

Between August and November 27, 1848, when he presented his irrevocable resignation due to war and "dirty passions" of politicians.