Irish Military Intelligence Service

The Irish Military Intelligence Service (IMIS) (Irish: Seirbhís Faisnéise Míleata na hÉireann) is the military intelligence branch of the Irish Defence Forces, and the national intelligence service of Ireland. Previously known as the Directorate of Military Intelligence (J2) until July 2025, the organisation has responsibility for the safety and security of the Irish Defence Forces, its personnel, and supporting the national security of Ireland. The service operates domestic and foreign intelligence sections, providing intelligence to the Government of Ireland concerning threats to the security of the state and the national interest from internal and external sources.

Military Intelligence is a constituent part of Defence Forces Headquarters (DFHQ) and is the intelligence section of all Defence Forces branches. IMIS is a joint service and draws military staff (both permanent and reservists) from the Army, Naval Service and Air Corps. The Irish military special operations forces, the Army Ranger Wing (ARW), carries out physical tasks in support of Military Intelligence in Ireland and overseas, and the Communications and Information Services Corps (CIS) provides technical and electronic support. IMIS works closely with the Garda Síochána Special Detective Unit (SDU), the national police counter-terrorism and counter-espionage unit.