The Secretariat for Central American Economic Integration (SIECA, per its Spanish acronym) is the technical and administrative body of the Central American Economic Integration Process, that acts as judicial person in accordance with international law.  Having been granted full operational autonomy, it also serves as liaison to the other Economic Subsystem Secretariats while coordinating with the Central American Integration System (SICA, for its Spanish acronym) General Secretariat.

SIECA oversees the proper implementation of the Protocol to the General Treaty on Central American Economic Integration (Guatemala Protocol), including all legal instruments pertaining to the regional economic integration; as well as the implementation of all decisions made by the different Economic Subsystem agencies.