The Regional Archives Network (XAC) is made up of regional archives that work to ensure the principles of provenance and regionality in the treatment and access to documents.

Each of the 41 archives of the network is responsible for organising, preserving, disseminating and facilitating access to the documentation and documentary heritage of their region, and also collaborates with the various public administrations.

In addition, they are also in charge of the custody of the documents of the municipalities of less than 10,000 inhabitants, notary protocols more than 100 years old, the documentation regarding the administration of Justice, the public records of the State, and any other documentation of historic or cultural interest for the area.

Since 1981 the three provincial archives (Girona, Lleida, Tarragona) also form part of the Regional Archives Network of the Catalan Government.