The State of Los Altos, commonly known as Los Altos, was the 6th state of the Federal Republic of Central America from 1838 to 1840 and a short-lived independent republic from 1848 to 1849. 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 Federal Republic of Central America, originally known as the United Provinces of Central America, was a sovereign state in Central America which existed from 1823 to 1839. The federal republic was composed of five states: Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. The federal republic was bordered to the north by Mexico, to the south by Gran Colombia, and on its eastern coastline by the Mosquito Coast and British Honduras.