The Military Geographic Institute (, IGM) is an agency of the Chilean Army responsible for producing and maintaining official cartography and geodetic reference information for Chile, for both defence and civilian uses.
Cartographic work linked to the Army predates the agency. During the Independence period, Bernardo O'Higgins established "" to create plans and maps needed for the liberation campaign. In 1891, President Jorge Montt created the Geographic Office () under the Army General Staff, and Over the years, the agency adopted various names.
The IGM was created by Decree No. 1664 of 29 August 1922, continuing work previously carried out by the Army's geographic and cartographic offices. In the 1930s, the agency expanded internal capabilities and staff training, including aerophotogrammetric work carried out in Chile with support from the Chilean Air Force. Chilean Army sources describe a 1947 cooperation agreement with the Inter-American Geodetic Survey of the United States, linked to joint technical work and aerophotogrammetric inputs used in national mapping. Analogue cartographic production began in 1955 using aerophotogrammetric flights, and later shifted from analogue to digital procedures toward the end of the 20th century and the start of the 21st century.
For scientific and educational dissemination, the agency publishes the journal , founded in 1948, and produces educational cartographic materials including an with editions used as school support material in Chile. In 1983, the agency also produced the multi-volume , described as a 32-volume set on aspects of Chilean geography.
In 2012, the agency launched a geoportal intended to provide public access to mapping-related information and services, including map viewing, catalogues, and educational resources.