The Intramuros Administration (IA) is an agency of the Department of Tourism of the Philippines that is mandated to orderly restore, administer, and develop the historic walled area of Intramuros that is situated within the modern City of Manila as well as to insure that the 16th- to 19th-century Philippine-Spanish architecture remains the general architectural style of the walled area.

It was established on April 10, 1979, as under the now-defunct Ministry of Human Settlements by virtue of Presidential Decree 1616 issued by President Ferdinand Marcos.

Intramuros in Manila is the only locality in the Philippines where, for cultural reasons, the use, height, scale, and aesthetics of all new constructions and development are pre-determined and strictly regulated under the force of a national law.

1616, is the main legal document prescribing and guiding the implementation of pre-war architectural colonial styles in Intramuros.

In contrast, the vernacular Bahay na Bato, which was adopted in majority of buildings, prevailed in terms of number of constructions.

It explicitly recognized the Bahay na Bato as the dominant architectural typology of Intramuros during the Spanish colonial era until the destruction of the Walled City in 1945 during the Second World War.