The Defence Infrastructure Service (Service d'Infrastructure de la Défense or SID) is a French body created at the end of 2005. It merges the three former entities in charge of Ministry of Defence buildings and properties:

• Central Engineers' Directorate, or Direction Centrale du Génie (Armée de Terre),
• Central Air Infrastructure Directorate, or Direction Centrale de l'Infrastructure de l'Air (Armée de l'Air)
• Central Directorate of Maritime Properties and Works, or Direction Centrale des Travaux Immobiliers et Maritimes (Marine nationale).

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