The Civil Aviation Accident and Incident Investigation Commission (Spanish: Comisión de Investigación de Accidentes e Incidentes de Aviación Civil, CIAIAC) is the Spanish national agency responsible for air accident investigation. It is a division of the Ministry of Public Works and Transport. The CIAIAC investigates all the accidents and incidents of civil aircraft that take place in Spanish territory.
The CIAIAC also maintains detailed statistics of all the air accidents and incidents in Spain.
The headquarters of the CIAIAC are in Latina, Madrid.