The Secretary of State for Defence (SEDEF) is the second-highest-ranking official in the Ministry of Defence of Spain. The SEDEF is a civilian which is appointed by the King with the advice of the Defence Minister. In spite of being the second authority of the Ministry, it is behind the Chief of the Defence Staff as far as military control is concerned.

The Ministry of Defence (MINISDEF) is the department of the Government of Spain responsible for planning, developing and carrying out the general guidelines of the Government about the defence policy and the managing of the military administration. It is the administrative and executive body of the Spanish Armed Forces.