The Court of Audit is a member of several international organizations of Supreme Audit Institutions, as EUROSAI, INTOSAI and OLACEFS. The Permanent Secretariat of EUROSAI is provided by the Spanish Court of Audit since inception. It also maintains relations with the European Court of Audit and participates in the audit of various international bodies.

The Court of Audit has coordination and collaboration relations with the External Audit Bodies of the Autonomous Regions, by establishing common audit criteria and techniques and the implementation of actions to ensure the most effective results and avoid duplication in audit actions.