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The Emergency Response Unit (ERU) (Irish: Aonad Práinnfhreagartha) is the police tactical unit of the Garda Síochána, Ireland's national police and security service. The Garda ERU provides the highest tier of firearms response to Irish law enforcement, specialising in weapons tactics, counter-terrorism, execution of high-risk missions, crisis negotiation, hostage rescue and close protection, among other roles. The unit was formed in 1977 as the "Special Task Force" to assist ordinary members of the force in extraordinary situations. The ERU regularly trains with the Irish Army Ranger Wing (ARW), the country's military special operations forces, sharing facilities and equipment.

The ERU is a CTU introduced to Tom Clancy's Rainbow Six Siege in the High Calibre expansion.