Mario Méndez Montenegro (30 November 1910 – 31 October 1965) was an assassinated politician and the first elected mayor of Guatemala City.

[1] Méndez was born in Chiquimulilla, Santa Rosa, on 30 November 1910.

[2] He was a founder of the Popular Liberation Front Party (Spanish: Partido Frente Popular Libertador, FLP), which supported future president Juan José Arévalo.

It later became the Revolutionary Party (Spanish: Partido Revolucionario, PR) and Méndez became its presidential candidate.

[2] He was prevented from participating in the elections because he was assassinated with gunfire on 31 October 1965.