| Secretary of State for Defence | |
|---|---|
| Secretario de Estado de Defensa | |
Coat of Arms used by the Government | |
| Ministry of Defence | |
| Style | The Most Excellent (formal) Mr./Ms. Secretary of State (informal) |
| Abbreviation | SEDEF |
| Reports to | Minister of Defence |
| Seat | Ministry of Defence HQ, Paseo de la Castellana no. 109 |
| Nominator | Minister of Defence |
| Appointer | |
| Term length |
|
Constituting instrument | Royal Decree 135/1984 |
| Precursor | Under-Secretary of Defence |
| Formation | 25 January 1984 |
| First holder | Eduardo Serra Rexach |
| Website | defensa.gob.es |
The secretary of state for defence (SEDEF) is a senior minister of the Spanish Ministry of Defence responsible for assisting the minister in the policies regarding armament and materiel, military research, development and innovation, economic management, infrastructure, environment, ICT and digital transformation.
Although the secretary of state has the same administrative rank as the Chief of the Defence Staff, the SEDEF does not have military authority. The officeholder is appointed by the Monarch on the advice of the Minister of Defence. The current Secretary of State for Defence, since 11 May 2022, is Ms. Amparo Valcarce, former Under-Secretary of Defence.
The position of Secretary of State for Defence was established during the 1984 military administration reform. The Secretariat of State addressed "the need to formulate a common policy and ensure its coordinated management across the three military branches".
To achieve this objetive, the secretary of state assumed responsabilities from the Under-Secretary of Defence regarding economic and armament affairs, and replaced it as the second-in-command to the minister. Also, a new Directorate-General for Infrastructure was created to coordinate the military to unify and coordinate the policy on military construction and facilities.
This organizational structure has remained stable over the last few decades, with two exceptions. First, in 2010, digital and communications powers within the Directorate-General for Infrastructure were reorganized, merging various bodies to create the Deputy Directorate-General for Information and Communication Technologies. This body—known since 2015 as the Centre for Information and Communication Systems and Technologies—was elevated to the rank of directorate-general in 2023 and currently reports to the secretary of state. Since 2026, this centre is also responsible for ensuring the security of data and communications for the Royal Household.
Second, in September 2024 a new Directorate-General for Strategy and Innovation of the Defence Industry was established assuming part of the responsibilities of the Directorate-General for Armament and Material regarding business internationalization, military industry support and R&D&I policies.
From the Secretary of State for Defence depends:

The following agencies also depends from the SEDEF:
For the purpose of this list, the date used is the date on which the decree of appointment or dismissal received royal assent, which may differ from the date of publication or of the effective taking of office.
| Name | Term of office | Government | Ref. | |||||
|---|---|---|---|---|---|---|---|---|
| Start | End | Duration | Prime Minister | Monarch | ||||
| Eduardo Serra Rexach (born 1946) |
8 February 1984 | 17 July 1987 | 3 years, 159 days | Felipe González (1982–1996) |
Juan Carlos I (1975–2014) |
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| Office vacant during this inverval. | ||||||||
| Rafael de la Cruz Corcoll (1945–2012) |
22 April 1988 | 11 October 1991 | 3 years, 172 days | |||||
| José Miguel Hernández Vázquez (1938–2013) |
11 October 1991 | 2 October 1992 | 357 days | |||||
| Antonio Flos Bassols | 9 October 1992 | 28 April 1995 | 2 years, 201 days | |||||
| Office vacant during this inverval. | ||||||||
| Juan Ramón García Secades (born 1948) |
7 July 1995 | 10 May 1996 | 308 days | |||||
| Pedro Morenés (born 1948) |
24 May 1996 | 5 May 2000 | 3 years, 347 days | José María Aznar (1996–2004) |
||||
| Fernando Díez Moreno (born 1941) |
5 May 2000 | 19 April 2004 | 3 years, 350 days | |||||
| Francisco Pardo (born 1962) |
19 April 2004 | 20 April 2007 | 3 years, 1 day | José Luis Rodríguez Zapatero (2004–2011) |
||||
| Soledad López Fernández (born 1959) |
20 April 2007 | 14 April 2008 | 360 days | |||||
| Constantino Méndez (1950–2023) |
14 April 2008 | 30 December 2011 | 3 years, 260 days | |||||
| Pedro Argüelles Salaverría (born 1950) |
5 January 2012 | 18 November 2016 | 4 years, 318 days | Mariano Rajoy (2011–2018) |
||||
Felipe VI (2014–present) | ||||||||
| Agustín Conde (born 1965) |
18 November 2016 | 8 June 2018 | 1 year, 202 days | |||||
| Ángel Olivares Ramírez (born 1955) |
8 June 2018 | 23 June 2020 | 2 years, 15 days | Pedro Sánchez (2018–) |
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| Esperanza Casteleiro (born 1956) |
30 June 2020 | 10 May 2022 | 1 year, 314 days | |||||
| Amparo Valcarce (born 1956) |
10 May 2022 | Incumbent | 4 years, 170 days | |||||