Los Altos (Spanish for "the highlands" or "the heights") was the sixth state of the Federal Republic of Central America, and a short-lived independent republic. Its capital was Quetzaltenango. Los Altos occupied eight departments in the west of present-day Guatemala as well as the Soconusco region in the Mexican state of Chiapas.

The state originated from the political differences and tensions between Guatemala City on one side, and Quetzaltenango and other parts of western Central America on the other. Debate about separation from Guatemala dated from shortly after Central American independence from Spain in 1821. Such a separate state was provided for by the Federal constitutional assembly of November 1824, but there was sizable opposition to the separation in Guatemala City.

The independence of Los Altos from Guatemala was officially proclaimed on 2 February 1838. The Federal government recognized Los Altos as the sixth state of the union and seated the representatives of Los Altos in the Federal Congress on 5 June of that year. The flag of Los Altos was a modification of that of the Central American Union, with a central seal showing a volcano in the background with a quetzal (a local bird symbolizing liberty) in front. This was the first Central American flag to use the quetzal as a symbol; since 1871, it has been on the present flag of Guatemala.

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