The National Archive of Torre do Tombo (Portuguese: Arquivo National da Torre do Tombo, [ɐɾˈkivu nɐsjuˈnaɫ dɐ ˈtoʁɨ ðu ˈtõbu]) is the Portuguese national archive established in 1378, located in center-north Lisbon, and renamed the Instituto dos Arquivos Nacionais (Institute of the National Archives) in 2009.
The archive is one of the oldest institutions in Portugal, since its installation in one of the towers of the castle in Lisbon, occurring during the reign of Ferdinand I, and likely in 1378 (the date where the first testimonal originated). The archive served as the King's and nobilities' reference, with documents supporting the administration of the kingdom and overseas territories, and documenting the relationships between the State and foreign kingdoms.
Following the events of the 1755 Lisbon earthquake, the High-Guardian of the archives, Manuel da Maia, was responsible for saving the contents of the Torre do Tombo. At 75 years old, Maia personally led the safe-guarding team to São Jorge Castle, where the archives were located, and saved nearly 90,000 pieces, accumulated between 1161 and 1696. He ordered the construction of provisionary barracks to store the contents of the archives and immediately made a request to Sebastião José de Carvalho e Melo, King Joseph I’s prime-minister, for a new permanent home for the archives, which would eventually be granted to him in the form of the Convent of São Bento (which now houses the parliament of Portugal).